{
  "meta": {
    "version": "4.4",
    "methodology": "WFB-POLITICAL-GOOGLE-MAP-POPUP-STATISTICS-AUDIT-4.4",
    "generatedAt": "2026-08-02T09:52:21.767455+10:00",
    "movementInterpretation": "Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
    "defaultMetric": "overnight",
    "defaultCorridor": "all",
    "featuredCorridorSlugs": [
      "dohertys-road",
      "fitzgerald-road",
      "grieve-parade",
      "a1-princes-highway-western-section",
      "sneydes-road"
    ],
    "finalisedAt": "2026-08-02T10:51:36.486720+10:00",
    "sparseHeadingPolicy": "Non-contributing headings are identified as secondary or sparse records and are not used for comparable political conclusions.",
    "coverageWording": "Observed reporting days between first and last available dates.",
    "allCorridorHeadlineBasis": "Average monitored direction across used directional headings.",
    "popupStatisticsAuditedAt": "2026-08-02T10:34:41.100065+10:00",
    "popupStatisticsPolicy": "Calculated percentages and frequencies are shown only for headings selected for the comparable corridor metric. Raw values for other headings remain in the audit export but are withheld from the public popup.",
    "sourceRegister": "\\\\bluemorpho\\StatsWebsiteWritable\\western-freight-burden\\infrastructure-accountability\\data\\tirtl_sensor_register.json",
    "politicalBriefingVersion": "6.0",
    "politicalBriefingMethodology": "WFB-INFRASTRUCTURE-ACCOUNTABILITY-POLITICAL-BRIEFING-6",
    "secondaryHeadingLabelPolicy": "Non-contributing opposite-direction headings use a neutral source-site location label in public popups.",
    "firstLoadReliabilityVersion": "6.3",
    "firstLoadReliabilityMethodology": "WFB-GOOGLE-MAPS-FIRST-LOAD-RELIABILITY-6.3",
    "firstLoadReliabilityUpdatedAt": "2026-08-02T11:38:39.974103+10:00",
    "googleMapsLoadingPolicy": "Both map components use one shared browser loader and one Google Maps JavaScript API request."
  },
  "summary": {
    "corridorCount": 5,
    "mappedHeadingRows": 23,
    "usedHeadingRows": 12
  },
  "corridors": [
    {
      "corridor": "Dohertys Road",
      "slug": "dohertys-road",
      "region": "West",
      "roadClass": "Industrial / freight arterial",
      "physicalSourceSiteCount": 2,
      "headingCount": 4,
      "usedHeadingCount": 2,
      "meanOvernightPassingsPerAvailableDay": 229.11290322580646,
      "equivalentMinutesBetweenOvernightPassings": 2.095036958817318,
      "sites": [
        {
          "corridor": "Dohertys Road",
          "corridorSlug": "dohertys-road",
          "sourceSite": "263",
          "siteName": "Dohertys Rd (EB)",
          "siteDescription": "Dohertys Rd (EB)",
          "locality": "ALTONA NORTH",
          "region": "West",
          "lat": -37.831143,
          "lng": 144.822901,
          "headingCount": 2,
          "usedHeadingCount": 1,
          "hasUsedHeading": true,
          "maximumOvernightPassingsPerAvailableDay": 231.98924731182797,
          "maximumTruckPct": 19.754756366812085,
          "maximumCoverageDays": 186,
          "headings": [
            {
              "corridor": "Dohertys Road",
              "corridorSlug": "dohertys-road",
              "sourceSite": "263",
              "headingCode": "E",
              "siteHeadingKey": "263_E",
              "tirtlSiteId": "TIRTL_263",
              "tirtlSiteHeadingId": "TIRTL_263_E",
              "siteName": "Dohertys Rd (EB)",
              "siteDescription": "Dohertys Rd (EB)",
              "locationLabel": "Dohertys Rd (EB)",
              "direction": "eastbound",
              "locality": "ALTONA NORTH",
              "lga": "",
              "region": "West",
              "lat": -37.831143,
              "lng": 144.822901,
              "usedInMetric": true,
              "metricStatus": "Used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-22",
              "coverageDays": 186,
              "vehiclePassings": 1710707.0,
              "truckPassings": 337946.0,
              "truckPct": 19.754756366812085,
              "truckPctMethod": "337,946 truck passings ÷ 1,710,707 classified vehicle passings",
              "averageSpeedKmh": null,
              "dayTruckPassings": 275703.0,
              "eveningTruckPassings": 19093.0,
              "nightTruckPassings": 43150.0,
              "overnightPassingsPerAvailableDay": 231.98924731182797,
              "allTruckPassingsPerAvailableDay": 1816.9139784946237,
              "averageMinutesBetweenOvernightPassings": 2.069061413673233,
              "nightShareOfTrucksPct": 12.768312097198962,
              "nightShareOfTrucksMethod": "43,150 overnight truck passings ÷ 337,946 all truck passings",
              "truckShareOfNightTrafficPct": 27.066697611983365,
              "exactSensorReference": "TIRTL source site 263; base site ID TIRTL_263; directional heading E; site-heading ID TIRTL_263_E; site-heading key 263_E; site label Dohertys Rd (EB); direction eastbound; coordinates -37.831143, 144.822901; locality Altona North; reporting coverage 2025-11-01 to 2026-05-22 (186 days); used in comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_263_E at Dohertys Rd (EB) recorded an average of 232.0 classified truck passings per day of available overnight data, equivalent to approximately one recorded truck passing every 2.1 minutes across the eight-hour 22:00–05:59 period. Records were observed on 186 days between 1 November 2025 and 22 May 2026. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "Given the measured heavy-vehicle exposure at TIRTL source site 263 (TIRTL_263_E) on Dohertys Rd (EB), what are the current pavement condition rating, last substantial resurfacing date, lighting assessment, five-year maintenance expenditure and funded upgrade status for the road segment surrounding this monitoring location?",
              "coverageDescription": "Records were observed on 186 days between 1 November 2025 and 22 May 2026.",
              "popupStatisticsStatus": "Comparable heading — public statistics verified",
              "popupStatisticsReason": "This directional heading is selected for the published comparable corridor metric, and its displayed statistics were recalculated from raw counts.",
              "rawSampleSummary": "337,946 truck passings among 1,710,707 classified vehicle passings; 43,150 overnight truck passings; 186 observed reporting days.",
              "auditRawTruckPct": 19.754756366812085,
              "auditRawNightShareOfTrucksPct": 12.768312097198962,
              "auditRawOvernightPassingsPerAvailableDay": 231.98924731182797,
              "auditRawAllTruckPassingsPerAvailableDay": 1816.9139784946237,
              "auditRawAverageMinutesBetweenOvernightPassings": 2.069061413673233,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099240+10:00",
              "popupStatisticsAuditVersion": "4.4"
            },
            {
              "corridor": "Dohertys Road",
              "corridorSlug": "dohertys-road",
              "sourceSite": "263",
              "headingCode": "W",
              "siteHeadingKey": "263_W",
              "tirtlSiteId": "TIRTL_263",
              "tirtlSiteHeadingId": "TIRTL_263_W",
              "siteName": "Dohertys Rd source-site location",
              "siteDescription": "Dohertys Rd source-site location",
              "locationLabel": "Dohertys Rd source-site location",
              "direction": "westbound",
              "locality": "ALTONA NORTH",
              "lga": "",
              "region": "West",
              "lat": -37.831143,
              "lng": 144.822901,
              "usedInMetric": false,
              "metricStatus": "Present at same source-site ID; not used in comparable valid-night metric",
              "firstDate": "2026-02-14",
              "lastDate": "2026-02-24",
              "coverageDays": 2,
              "vehiclePassings": 14.0,
              "truckPassings": 0.0,
              "truckPct": null,
              "truckPctMethod": "Not shown publicly — non-contributing heading",
              "averageSpeedKmh": null,
              "dayTruckPassings": 0.0,
              "eveningTruckPassings": 0.0,
              "nightTruckPassings": 0.0,
              "overnightPassingsPerAvailableDay": null,
              "allTruckPassingsPerAvailableDay": null,
              "averageMinutesBetweenOvernightPassings": null,
              "nightShareOfTrucksPct": null,
              "nightShareOfTrucksMethod": "Not shown publicly — non-contributing heading",
              "truckShareOfNightTrafficPct": null,
              "exactSensorReference": "TIRTL source-site ID 263; base site ID TIRTL_263; directional heading W; site-heading ID TIRTL_263_W; site-heading key 263_W; neutral source-site label Dohertys Rd source-site location; direction westbound; coordinates -37.831143, 144.822901; locality Altona North; records observed 2026-02-14 to 2026-02-24 (2 days); not used in the comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_263_W is a secondary or sparse westbound heading at the Dohertys Rd source-site location. It was not used in the comparable corridor metric. 0 truck passings among 14 classified vehicle passings; 0 overnight truck passings; 2 observed reporting days. No comparable freight conclusion should be drawn from this record. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "TIRTL_263_W is not used in the comparable corridor metric. Infrastructure accountability questions should be based on the contributing heading or headings at TIRTL source site 263.",
              "coverageDescription": "Records were observed on 2 days between 14 February 2026 and 24 February 2026.",
              "popupStatisticsStatus": "Not used in comparable corridor metric",
              "popupStatisticsReason": "Percentages and frequency are withheld from the public popup because this is a secondary or sparse heading record, not a contributing comparison heading.",
              "rawSampleSummary": "0 truck passings among 14 classified vehicle passings; 0 overnight truck passings; 2 observed reporting days.",
              "auditRawTruckPct": 0.0,
              "auditRawNightShareOfTrucksPct": null,
              "auditRawOvernightPassingsPerAvailableDay": 0.0,
              "auditRawAllTruckPassingsPerAvailableDay": 0.0,
              "auditRawAverageMinutesBetweenOvernightPassings": null,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099339+10:00",
              "popupStatisticsAuditVersion": "4.4",
              "originalSourceSiteLabel": "Dohertys Rd (EB)",
              "publicLocationLabel": "Dohertys Rd source-site location",
              "publicLabelPolicy": "Neutral source-site location used because the source-site name carries the principal heading direction, while this secondary record has the opposite direction."
            }
          ]
        },
        {
          "corridor": "Dohertys Road",
          "corridorSlug": "dohertys-road",
          "sourceSite": "264",
          "siteName": "Dohertys Rd (WB)",
          "siteDescription": "Dohertys Rd (WB)",
          "locality": "ALTONA NORTH",
          "region": "West",
          "lat": -37.831211,
          "lng": 144.822392,
          "headingCount": 2,
          "usedHeadingCount": 1,
          "hasUsedHeading": true,
          "maximumOvernightPassingsPerAvailableDay": 226.23655913978496,
          "maximumTruckPct": 22.46206420469975,
          "maximumCoverageDays": 186,
          "headings": [
            {
              "corridor": "Dohertys Road",
              "corridorSlug": "dohertys-road",
              "sourceSite": "264",
              "headingCode": "W",
              "siteHeadingKey": "264_W",
              "tirtlSiteId": "TIRTL_264",
              "tirtlSiteHeadingId": "TIRTL_264_W",
              "siteName": "Dohertys Rd (WB)",
              "siteDescription": "Dohertys Rd (WB)",
              "locationLabel": "Dohertys Rd (WB)",
              "direction": "westbound",
              "locality": "ALTONA NORTH",
              "lga": "",
              "region": "West",
              "lat": -37.831211,
              "lng": 144.822392,
              "usedInMetric": true,
              "metricStatus": "Used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-22",
              "coverageDays": 186,
              "vehiclePassings": 1576084.0,
              "truckPassings": 354021.0,
              "truckPct": 22.46206420469975,
              "truckPctMethod": "354,021 truck passings ÷ 1,576,084 classified vehicle passings",
              "averageSpeedKmh": null,
              "dayTruckPassings": 285695.0,
              "eveningTruckPassings": 26246.0,
              "nightTruckPassings": 42080.0,
              "overnightPassingsPerAvailableDay": 226.23655913978496,
              "allTruckPassingsPerAvailableDay": 1903.3387096774193,
              "averageMinutesBetweenOvernightPassings": 2.121673003802281,
              "nightShareOfTrucksPct": 11.886300530194536,
              "nightShareOfTrucksMethod": "42,080 overnight truck passings ÷ 354,021 all truck passings",
              "truckShareOfNightTrafficPct": 19.572001990688417,
              "exactSensorReference": "TIRTL source site 264; base site ID TIRTL_264; directional heading W; site-heading ID TIRTL_264_W; site-heading key 264_W; site label Dohertys Rd (WB); direction westbound; coordinates -37.831211, 144.822392; locality Altona North; reporting coverage 2025-11-01 to 2026-05-22 (186 days); used in comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_264_W at Dohertys Rd (WB) recorded an average of 226.2 classified truck passings per day of available overnight data, equivalent to approximately one recorded truck passing every 2.1 minutes across the eight-hour 22:00–05:59 period. Records were observed on 186 days between 1 November 2025 and 22 May 2026. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "Given the measured heavy-vehicle exposure at TIRTL source site 264 (TIRTL_264_W) on Dohertys Rd (WB), what are the current pavement condition rating, last substantial resurfacing date, lighting assessment, five-year maintenance expenditure and funded upgrade status for the road segment surrounding this monitoring location?",
              "coverageDescription": "Records were observed on 186 days between 1 November 2025 and 22 May 2026.",
              "popupStatisticsStatus": "Comparable heading — public statistics verified",
              "popupStatisticsReason": "This directional heading is selected for the published comparable corridor metric, and its displayed statistics were recalculated from raw counts.",
              "rawSampleSummary": "354,021 truck passings among 1,576,084 classified vehicle passings; 42,080 overnight truck passings; 186 observed reporting days.",
              "auditRawTruckPct": 22.46206420469975,
              "auditRawNightShareOfTrucksPct": 11.886300530194536,
              "auditRawOvernightPassingsPerAvailableDay": 226.23655913978496,
              "auditRawAllTruckPassingsPerAvailableDay": 1903.3387096774193,
              "auditRawAverageMinutesBetweenOvernightPassings": 2.121673003802281,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099383+10:00",
              "popupStatisticsAuditVersion": "4.4"
            },
            {
              "corridor": "Dohertys Road",
              "corridorSlug": "dohertys-road",
              "sourceSite": "264",
              "headingCode": "E",
              "siteHeadingKey": "264_E",
              "tirtlSiteId": "TIRTL_264",
              "tirtlSiteHeadingId": "TIRTL_264_E",
              "siteName": "Dohertys Rd source-site location",
              "siteDescription": "Dohertys Rd source-site location",
              "locationLabel": "Dohertys Rd source-site location",
              "direction": "eastbound",
              "locality": "ALTONA NORTH",
              "lga": "",
              "region": "West",
              "lat": -37.831211,
              "lng": 144.822392,
              "usedInMetric": false,
              "metricStatus": "Present at same source-site ID; not used in comparable valid-night metric",
              "firstDate": "2025-11-10",
              "lastDate": "2026-05-10",
              "coverageDays": 7,
              "vehiclePassings": 9.0,
              "truckPassings": 0.0,
              "truckPct": null,
              "truckPctMethod": "Not shown publicly — non-contributing heading",
              "averageSpeedKmh": null,
              "dayTruckPassings": 0.0,
              "eveningTruckPassings": 0.0,
              "nightTruckPassings": 0.0,
              "overnightPassingsPerAvailableDay": null,
              "allTruckPassingsPerAvailableDay": null,
              "averageMinutesBetweenOvernightPassings": null,
              "nightShareOfTrucksPct": null,
              "nightShareOfTrucksMethod": "Not shown publicly — non-contributing heading",
              "truckShareOfNightTrafficPct": 0.0,
              "exactSensorReference": "TIRTL source-site ID 264; base site ID TIRTL_264; directional heading E; site-heading ID TIRTL_264_E; site-heading key 264_E; neutral source-site label Dohertys Rd source-site location; direction eastbound; coordinates -37.831211, 144.822392; locality Altona North; records observed 2025-11-10 to 2026-05-10 (7 days); not used in the comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_264_E is a secondary or sparse eastbound heading at the Dohertys Rd source-site location. It was not used in the comparable corridor metric. 0 truck passings among 9 classified vehicle passings; 0 overnight truck passings; 7 observed reporting days. No comparable freight conclusion should be drawn from this record. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "TIRTL_264_E is not used in the comparable corridor metric. Infrastructure accountability questions should be based on the contributing heading or headings at TIRTL source site 264.",
              "coverageDescription": "Records were observed on 7 days between 10 November 2025 and 10 May 2026.",
              "popupStatisticsStatus": "Not used in comparable corridor metric",
              "popupStatisticsReason": "Percentages and frequency are withheld from the public popup because this is a secondary or sparse heading record, not a contributing comparison heading.",
              "rawSampleSummary": "0 truck passings among 9 classified vehicle passings; 0 overnight truck passings; 7 observed reporting days.",
              "auditRawTruckPct": 0.0,
              "auditRawNightShareOfTrucksPct": null,
              "auditRawOvernightPassingsPerAvailableDay": 0.0,
              "auditRawAllTruckPassingsPerAvailableDay": 0.0,
              "auditRawAverageMinutesBetweenOvernightPassings": null,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099412+10:00",
              "popupStatisticsAuditVersion": "4.4",
              "originalSourceSiteLabel": "Dohertys Rd (WB)",
              "publicLocationLabel": "Dohertys Rd source-site location",
              "publicLabelPolicy": "Neutral source-site location used because the source-site name carries the principal heading direction, while this secondary record has the opposite direction."
            }
          ]
        }
      ]
    },
    {
      "corridor": "Fitzgerald Road",
      "slug": "fitzgerald-road",
      "region": "West",
      "roadClass": "Industrial / freight arterial",
      "physicalSourceSiteCount": 2,
      "headingCount": 4,
      "usedHeadingCount": 2,
      "meanOvernightPassingsPerAvailableDay": 157.3763440860215,
      "equivalentMinutesBetweenOvernightPassings": 3.0500136649357747,
      "sites": [
        {
          "corridor": "Fitzgerald Road",
          "corridorSlug": "fitzgerald-road",
          "sourceSite": "255",
          "siteName": "Fitzgerald Rd and Federation trail (NB)",
          "siteDescription": "Fitzgerald Rd and Federation trail (NB)",
          "locality": "LAVERTON NORTH",
          "region": "West",
          "lat": -37.835621,
          "lng": 144.783706,
          "headingCount": 2,
          "usedHeadingCount": 1,
          "hasUsedHeading": true,
          "maximumOvernightPassingsPerAvailableDay": 158.3709677419355,
          "maximumTruckPct": 15.321155580846133,
          "maximumCoverageDays": 186,
          "headings": [
            {
              "corridor": "Fitzgerald Road",
              "corridorSlug": "fitzgerald-road",
              "sourceSite": "255",
              "headingCode": "N",
              "siteHeadingKey": "255_N",
              "tirtlSiteId": "TIRTL_255",
              "tirtlSiteHeadingId": "TIRTL_255_N",
              "siteName": "Fitzgerald Rd and Federation trail (NB)",
              "siteDescription": "Fitzgerald Rd and Federation trail (NB)",
              "locationLabel": "Fitzgerald Rd and Federation trail (NB)",
              "direction": "northbound",
              "locality": "LAVERTON NORTH",
              "lga": "",
              "region": "West",
              "lat": -37.835621,
              "lng": 144.783706,
              "usedInMetric": true,
              "metricStatus": "Used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-22",
              "coverageDays": 186,
              "vehiclePassings": 1567558.0,
              "truckPassings": 240168.0,
              "truckPct": 15.321155580846133,
              "truckPctMethod": "240,168 truck passings ÷ 1,567,558 classified vehicle passings",
              "averageSpeedKmh": null,
              "dayTruckPassings": 194341.0,
              "eveningTruckPassings": 16370.0,
              "nightTruckPassings": 29457.0,
              "overnightPassingsPerAvailableDay": 158.3709677419355,
              "allTruckPassingsPerAvailableDay": 1291.225806451613,
              "averageMinutesBetweenOvernightPassings": 3.030858539566147,
              "nightShareOfTrucksPct": 12.26516438493055,
              "nightShareOfTrucksMethod": "29,457 overnight truck passings ÷ 240,168 all truck passings",
              "truckShareOfNightTrafficPct": 11.183413756316464,
              "exactSensorReference": "TIRTL source site 255; base site ID TIRTL_255; directional heading N; site-heading ID TIRTL_255_N; site-heading key 255_N; site label Fitzgerald Rd and Federation trail (NB); direction northbound; coordinates -37.835621, 144.783706; locality Laverton North; reporting coverage 2025-11-01 to 2026-05-22 (186 days); used in comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_255_N at Fitzgerald Rd and Federation trail (NB) recorded an average of 158.4 classified truck passings per day of available overnight data, equivalent to approximately one recorded truck passing every 3.0 minutes across the eight-hour 22:00–05:59 period. Records were observed on 186 days between 1 November 2025 and 22 May 2026. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "Given the measured heavy-vehicle exposure at TIRTL source site 255 (TIRTL_255_N) on Fitzgerald Rd and Federation trail (NB), what are the current pavement condition rating, last substantial resurfacing date, lighting assessment, five-year maintenance expenditure and funded upgrade status for the road segment surrounding this monitoring location?",
              "coverageDescription": "Records were observed on 186 days between 1 November 2025 and 22 May 2026.",
              "popupStatisticsStatus": "Comparable heading — public statistics verified",
              "popupStatisticsReason": "This directional heading is selected for the published comparable corridor metric, and its displayed statistics were recalculated from raw counts.",
              "rawSampleSummary": "240,168 truck passings among 1,567,558 classified vehicle passings; 29,457 overnight truck passings; 186 observed reporting days.",
              "auditRawTruckPct": 15.321155580846133,
              "auditRawNightShareOfTrucksPct": 12.26516438493055,
              "auditRawOvernightPassingsPerAvailableDay": 158.3709677419355,
              "auditRawAllTruckPassingsPerAvailableDay": 1291.225806451613,
              "auditRawAverageMinutesBetweenOvernightPassings": 3.030858539566147,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099447+10:00",
              "popupStatisticsAuditVersion": "4.4"
            },
            {
              "corridor": "Fitzgerald Road",
              "corridorSlug": "fitzgerald-road",
              "sourceSite": "255",
              "headingCode": "S",
              "siteHeadingKey": "255_S",
              "tirtlSiteId": "TIRTL_255",
              "tirtlSiteHeadingId": "TIRTL_255_S",
              "siteName": "Fitzgerald Rd and Federation trail source-site location",
              "siteDescription": "Fitzgerald Rd and Federation trail source-site location",
              "locationLabel": "Fitzgerald Rd and Federation trail source-site location",
              "direction": "southbound",
              "locality": "LAVERTON NORTH",
              "lga": "",
              "region": "West",
              "lat": -37.835621,
              "lng": 144.783706,
              "usedInMetric": false,
              "metricStatus": "Present at same source-site ID; not used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-11",
              "coverageDays": 75,
              "vehiclePassings": 142.0,
              "truckPassings": 9.0,
              "truckPct": null,
              "truckPctMethod": "Not shown publicly — non-contributing heading",
              "averageSpeedKmh": null,
              "dayTruckPassings": 0.0,
              "eveningTruckPassings": 3.0,
              "nightTruckPassings": 6.0,
              "overnightPassingsPerAvailableDay": null,
              "allTruckPassingsPerAvailableDay": null,
              "averageMinutesBetweenOvernightPassings": null,
              "nightShareOfTrucksPct": null,
              "nightShareOfTrucksMethod": "Not shown publicly — non-contributing heading",
              "truckShareOfNightTrafficPct": 12.76595744680851,
              "exactSensorReference": "TIRTL source-site ID 255; base site ID TIRTL_255; directional heading S; site-heading ID TIRTL_255_S; site-heading key 255_S; neutral source-site label Fitzgerald Rd and Federation trail source-site location; direction southbound; coordinates -37.835621, 144.783706; locality Laverton North; records observed 2025-11-01 to 2026-05-11 (75 days); not used in the comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_255_S is a secondary or sparse southbound heading at the Fitzgerald Rd and Federation trail source-site location. It was not used in the comparable corridor metric. 9 truck passings among 142 classified vehicle passings; 6 overnight truck passings; 75 observed reporting days. No comparable freight conclusion should be drawn from this record. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "TIRTL_255_S is not used in the comparable corridor metric. Infrastructure accountability questions should be based on the contributing heading or headings at TIRTL source site 255.",
              "coverageDescription": "Records were observed on 75 days between 1 November 2025 and 11 May 2026.",
              "popupStatisticsStatus": "Not used in comparable corridor metric",
              "popupStatisticsReason": "Percentages and frequency are withheld from the public popup because this is a secondary or sparse heading record, not a contributing comparison heading.",
              "rawSampleSummary": "9 truck passings among 142 classified vehicle passings; 6 overnight truck passings; 75 observed reporting days.",
              "auditRawTruckPct": 6.338028169014084,
              "auditRawNightShareOfTrucksPct": 66.66666666666666,
              "auditRawOvernightPassingsPerAvailableDay": 0.08,
              "auditRawAllTruckPassingsPerAvailableDay": 0.12,
              "auditRawAverageMinutesBetweenOvernightPassings": 6000.0,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099474+10:00",
              "popupStatisticsAuditVersion": "4.4",
              "originalSourceSiteLabel": "Fitzgerald Rd and Federation trail (NB)",
              "publicLocationLabel": "Fitzgerald Rd and Federation trail source-site location",
              "publicLabelPolicy": "Neutral source-site location used because the source-site name carries the principal heading direction, while this secondary record has the opposite direction."
            }
          ]
        },
        {
          "corridor": "Fitzgerald Road",
          "corridorSlug": "fitzgerald-road",
          "sourceSite": "256",
          "siteName": "Fitzgerald Rd and Federation trail (SB)",
          "siteDescription": "Fitzgerald Rd and Federation trail (SB)",
          "locality": "LAVERTON NORTH",
          "region": "West",
          "lat": -37.835882,
          "lng": 144.783932,
          "headingCount": 2,
          "usedHeadingCount": 1,
          "hasUsedHeading": true,
          "maximumOvernightPassingsPerAvailableDay": 156.38172043010752,
          "maximumTruckPct": 15.338486038128279,
          "maximumCoverageDays": 186,
          "headings": [
            {
              "corridor": "Fitzgerald Road",
              "corridorSlug": "fitzgerald-road",
              "sourceSite": "256",
              "headingCode": "S",
              "siteHeadingKey": "256_S",
              "tirtlSiteId": "TIRTL_256",
              "tirtlSiteHeadingId": "TIRTL_256_S",
              "siteName": "Fitzgerald Rd and Federation trail (SB)",
              "siteDescription": "Fitzgerald Rd and Federation trail (SB)",
              "locationLabel": "Fitzgerald Rd and Federation trail (SB)",
              "direction": "southbound",
              "locality": "LAVERTON NORTH",
              "lga": "",
              "region": "West",
              "lat": -37.835882,
              "lng": 144.783932,
              "usedInMetric": true,
              "metricStatus": "Used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-22",
              "coverageDays": 186,
              "vehiclePassings": 1688563.0,
              "truckPassings": 259000.0,
              "truckPct": 15.338486038128279,
              "truckPctMethod": "259,000 truck passings ÷ 1,688,563 classified vehicle passings",
              "averageSpeedKmh": null,
              "dayTruckPassings": 211505.0,
              "eveningTruckPassings": 18408.0,
              "nightTruckPassings": 29087.0,
              "overnightPassingsPerAvailableDay": 156.38172043010752,
              "allTruckPassingsPerAvailableDay": 1392.47311827957,
              "averageMinutesBetweenOvernightPassings": 3.0694124522982777,
              "nightShareOfTrucksPct": 11.23050193050193,
              "nightShareOfTrucksMethod": "29,087 overnight truck passings ÷ 259,000 all truck passings",
              "truckShareOfNightTrafficPct": 15.563534019647712,
              "exactSensorReference": "TIRTL source site 256; base site ID TIRTL_256; directional heading S; site-heading ID TIRTL_256_S; site-heading key 256_S; site label Fitzgerald Rd and Federation trail (SB); direction southbound; coordinates -37.835882, 144.783932; locality Laverton North; reporting coverage 2025-11-01 to 2026-05-22 (186 days); used in comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_256_S at Fitzgerald Rd and Federation trail (SB) recorded an average of 156.4 classified truck passings per day of available overnight data, equivalent to approximately one recorded truck passing every 3.1 minutes across the eight-hour 22:00–05:59 period. Records were observed on 186 days between 1 November 2025 and 22 May 2026. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "Given the measured heavy-vehicle exposure at TIRTL source site 256 (TIRTL_256_S) on Fitzgerald Rd and Federation trail (SB), what are the current pavement condition rating, last substantial resurfacing date, lighting assessment, five-year maintenance expenditure and funded upgrade status for the road segment surrounding this monitoring location?",
              "coverageDescription": "Records were observed on 186 days between 1 November 2025 and 22 May 2026.",
              "popupStatisticsStatus": "Comparable heading — public statistics verified",
              "popupStatisticsReason": "This directional heading is selected for the published comparable corridor metric, and its displayed statistics were recalculated from raw counts.",
              "rawSampleSummary": "259,000 truck passings among 1,688,563 classified vehicle passings; 29,087 overnight truck passings; 186 observed reporting days.",
              "auditRawTruckPct": 15.338486038128279,
              "auditRawNightShareOfTrucksPct": 11.23050193050193,
              "auditRawOvernightPassingsPerAvailableDay": 156.38172043010752,
              "auditRawAllTruckPassingsPerAvailableDay": 1392.47311827957,
              "auditRawAverageMinutesBetweenOvernightPassings": 3.0694124522982777,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099511+10:00",
              "popupStatisticsAuditVersion": "4.4"
            },
            {
              "corridor": "Fitzgerald Road",
              "corridorSlug": "fitzgerald-road",
              "sourceSite": "256",
              "headingCode": "N",
              "siteHeadingKey": "256_N",
              "tirtlSiteId": "TIRTL_256",
              "tirtlSiteHeadingId": "TIRTL_256_N",
              "siteName": "Fitzgerald Rd and Federation trail source-site location",
              "siteDescription": "Fitzgerald Rd and Federation trail source-site location",
              "locationLabel": "Fitzgerald Rd and Federation trail source-site location",
              "direction": "northbound",
              "locality": "LAVERTON NORTH",
              "lga": "",
              "region": "West",
              "lat": -37.835882,
              "lng": 144.783932,
              "usedInMetric": false,
              "metricStatus": "Present at same source-site ID; not used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-20",
              "coverageDays": 74,
              "vehiclePassings": 200.0,
              "truckPassings": 35.0,
              "truckPct": null,
              "truckPctMethod": "Not shown publicly — non-contributing heading",
              "averageSpeedKmh": null,
              "dayTruckPassings": 5.0,
              "eveningTruckPassings": 25.0,
              "nightTruckPassings": 5.0,
              "overnightPassingsPerAvailableDay": null,
              "allTruckPassingsPerAvailableDay": null,
              "averageMinutesBetweenOvernightPassings": null,
              "nightShareOfTrucksPct": null,
              "nightShareOfTrucksMethod": "Not shown publicly — non-contributing heading",
              "truckShareOfNightTrafficPct": 9.25925925925926,
              "exactSensorReference": "TIRTL source-site ID 256; base site ID TIRTL_256; directional heading N; site-heading ID TIRTL_256_N; site-heading key 256_N; neutral source-site label Fitzgerald Rd and Federation trail source-site location; direction northbound; coordinates -37.835882, 144.783932; locality Laverton North; records observed 2025-11-01 to 2026-05-20 (74 days); not used in the comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_256_N is a secondary or sparse northbound heading at the Fitzgerald Rd and Federation trail source-site location. It was not used in the comparable corridor metric. 35 truck passings among 200 classified vehicle passings; 5 overnight truck passings; 74 observed reporting days. No comparable freight conclusion should be drawn from this record. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "TIRTL_256_N is not used in the comparable corridor metric. Infrastructure accountability questions should be based on the contributing heading or headings at TIRTL source site 256.",
              "coverageDescription": "Records were observed on 74 days between 1 November 2025 and 20 May 2026.",
              "popupStatisticsStatus": "Not used in comparable corridor metric",
              "popupStatisticsReason": "Percentages and frequency are withheld from the public popup because this is a secondary or sparse heading record, not a contributing comparison heading.",
              "rawSampleSummary": "35 truck passings among 200 classified vehicle passings; 5 overnight truck passings; 74 observed reporting days.",
              "auditRawTruckPct": 17.5,
              "auditRawNightShareOfTrucksPct": 14.285714285714285,
              "auditRawOvernightPassingsPerAvailableDay": 0.06756756756756757,
              "auditRawAllTruckPassingsPerAvailableDay": 0.47297297297297297,
              "auditRawAverageMinutesBetweenOvernightPassings": 7104.0,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099540+10:00",
              "popupStatisticsAuditVersion": "4.4",
              "originalSourceSiteLabel": "Fitzgerald Rd and Federation trail (SB)",
              "publicLocationLabel": "Fitzgerald Rd and Federation trail source-site location",
              "publicLabelPolicy": "Neutral source-site location used because the source-site name carries the principal heading direction, while this secondary record has the opposite direction."
            }
          ]
        }
      ]
    },
    {
      "corridor": "Grieve Parade",
      "slug": "grieve-parade",
      "region": "West",
      "roadClass": "Industrial / freight arterial",
      "physicalSourceSiteCount": 2,
      "headingCount": 3,
      "usedHeadingCount": 2,
      "meanOvernightPassingsPerAvailableDay": 79.6989247311828,
      "equivalentMinutesBetweenOvernightPassings": 6.02266594711279,
      "sites": [
        {
          "corridor": "Grieve Parade",
          "corridorSlug": "grieve-parade",
          "sourceSite": "261",
          "siteName": "Grieve Pde (NB)",
          "siteDescription": "Grieve Pde (NB)",
          "locality": "ALTONA NORTH",
          "region": "West",
          "lat": -37.844198,
          "lng": 144.824831,
          "headingCount": 2,
          "usedHeadingCount": 1,
          "hasUsedHeading": true,
          "maximumOvernightPassingsPerAvailableDay": 88.96236559139786,
          "maximumTruckPct": 14.899940162888804,
          "maximumCoverageDays": 186,
          "headings": [
            {
              "corridor": "Grieve Parade",
              "corridorSlug": "grieve-parade",
              "sourceSite": "261",
              "headingCode": "N",
              "siteHeadingKey": "261_N",
              "tirtlSiteId": "TIRTL_261",
              "tirtlSiteHeadingId": "TIRTL_261_N",
              "siteName": "Grieve Pde (NB)",
              "siteDescription": "Grieve Pde (NB)",
              "locationLabel": "Grieve Pde (NB)",
              "direction": "northbound",
              "locality": "ALTONA NORTH",
              "lga": "",
              "region": "West",
              "lat": -37.844198,
              "lng": 144.824831,
              "usedInMetric": true,
              "metricStatus": "Used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-22",
              "coverageDays": 186,
              "vehiclePassings": 1001051.0,
              "truckPassings": 149156.0,
              "truckPct": 14.899940162888804,
              "truckPctMethod": "149,156 truck passings ÷ 1,001,051 classified vehicle passings",
              "averageSpeedKmh": null,
              "dayTruckPassings": 121987.0,
              "eveningTruckPassings": 10622.0,
              "nightTruckPassings": 16547.0,
              "overnightPassingsPerAvailableDay": 88.96236559139786,
              "allTruckPassingsPerAvailableDay": 801.9139784946236,
              "averageMinutesBetweenOvernightPassings": 5.395539977035112,
              "nightShareOfTrucksPct": 11.093754190243772,
              "nightShareOfTrucksMethod": "16,547 overnight truck passings ÷ 149,156 all truck passings",
              "truckShareOfNightTrafficPct": 18.50874151295847,
              "exactSensorReference": "TIRTL source site 261; base site ID TIRTL_261; directional heading N; site-heading ID TIRTL_261_N; site-heading key 261_N; site label Grieve Pde (NB); direction northbound; coordinates -37.844198, 144.824831; locality Altona North; reporting coverage 2025-11-01 to 2026-05-22 (186 days); used in comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_261_N at Grieve Pde (NB) recorded an average of 89.0 classified truck passings per day of available overnight data, equivalent to approximately one recorded truck passing every 5.4 minutes across the eight-hour 22:00–05:59 period. Records were observed on 186 days between 1 November 2025 and 22 May 2026. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "Given the measured heavy-vehicle exposure at TIRTL source site 261 (TIRTL_261_N) on Grieve Pde (NB), what are the current pavement condition rating, last substantial resurfacing date, lighting assessment, five-year maintenance expenditure and funded upgrade status for the road segment surrounding this monitoring location?",
              "coverageDescription": "Records were observed on 186 days between 1 November 2025 and 22 May 2026.",
              "popupStatisticsStatus": "Comparable heading — public statistics verified",
              "popupStatisticsReason": "This directional heading is selected for the published comparable corridor metric, and its displayed statistics were recalculated from raw counts.",
              "rawSampleSummary": "149,156 truck passings among 1,001,051 classified vehicle passings; 16,547 overnight truck passings; 186 observed reporting days.",
              "auditRawTruckPct": 14.899940162888804,
              "auditRawNightShareOfTrucksPct": 11.093754190243772,
              "auditRawOvernightPassingsPerAvailableDay": 88.96236559139786,
              "auditRawAllTruckPassingsPerAvailableDay": 801.9139784946236,
              "auditRawAverageMinutesBetweenOvernightPassings": 5.395539977035112,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099580+10:00",
              "popupStatisticsAuditVersion": "4.4"
            },
            {
              "corridor": "Grieve Parade",
              "corridorSlug": "grieve-parade",
              "sourceSite": "261",
              "headingCode": "S",
              "siteHeadingKey": "261_S",
              "tirtlSiteId": "TIRTL_261",
              "tirtlSiteHeadingId": "TIRTL_261_S",
              "siteName": "Grieve Pde source-site location",
              "siteDescription": "Grieve Pde source-site location",
              "locationLabel": "Grieve Pde source-site location",
              "direction": "southbound",
              "locality": "ALTONA NORTH",
              "lga": "",
              "region": "West",
              "lat": -37.844198,
              "lng": 144.824831,
              "usedInMetric": false,
              "metricStatus": "Present at same source-site ID; not used in comparable valid-night metric",
              "firstDate": "2025-11-17",
              "lastDate": "2026-04-08",
              "coverageDays": 2,
              "vehiclePassings": 2.0,
              "truckPassings": 0.0,
              "truckPct": null,
              "truckPctMethod": "Not shown publicly — non-contributing heading",
              "averageSpeedKmh": null,
              "dayTruckPassings": 0.0,
              "eveningTruckPassings": 0.0,
              "nightTruckPassings": 0.0,
              "overnightPassingsPerAvailableDay": null,
              "allTruckPassingsPerAvailableDay": null,
              "averageMinutesBetweenOvernightPassings": null,
              "nightShareOfTrucksPct": null,
              "nightShareOfTrucksMethod": "Not shown publicly — non-contributing heading",
              "truckShareOfNightTrafficPct": null,
              "exactSensorReference": "TIRTL source-site ID 261; base site ID TIRTL_261; directional heading S; site-heading ID TIRTL_261_S; site-heading key 261_S; neutral source-site label Grieve Pde source-site location; direction southbound; coordinates -37.844198, 144.824831; locality Altona North; records observed 2025-11-17 to 2026-04-08 (2 days); not used in the comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_261_S is a secondary or sparse southbound heading at the Grieve Pde source-site location. It was not used in the comparable corridor metric. 0 truck passings among 2 classified vehicle passings; 0 overnight truck passings; 2 observed reporting days. No comparable freight conclusion should be drawn from this record. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "TIRTL_261_S is not used in the comparable corridor metric. Infrastructure accountability questions should be based on the contributing heading or headings at TIRTL source site 261.",
              "coverageDescription": "Records were observed on 2 days between 17 November 2025 and 8 April 2026.",
              "popupStatisticsStatus": "Not used in comparable corridor metric",
              "popupStatisticsReason": "Percentages and frequency are withheld from the public popup because this is a secondary or sparse heading record, not a contributing comparison heading.",
              "rawSampleSummary": "0 truck passings among 2 classified vehicle passings; 0 overnight truck passings; 2 observed reporting days.",
              "auditRawTruckPct": 0.0,
              "auditRawNightShareOfTrucksPct": null,
              "auditRawOvernightPassingsPerAvailableDay": 0.0,
              "auditRawAllTruckPassingsPerAvailableDay": 0.0,
              "auditRawAverageMinutesBetweenOvernightPassings": null,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099606+10:00",
              "popupStatisticsAuditVersion": "4.4",
              "originalSourceSiteLabel": "Grieve Pde (NB)",
              "publicLocationLabel": "Grieve Pde source-site location",
              "publicLabelPolicy": "Neutral source-site location used because the source-site name carries the principal heading direction, while this secondary record has the opposite direction."
            }
          ]
        },
        {
          "corridor": "Grieve Parade",
          "corridorSlug": "grieve-parade",
          "sourceSite": "262",
          "siteName": "Grieve Pde (SB)",
          "siteDescription": "Grieve Pde (SB)",
          "locality": "ALTONA NORTH",
          "region": "West",
          "lat": -37.844896,
          "lng": 144.825018,
          "headingCount": 1,
          "usedHeadingCount": 1,
          "hasUsedHeading": true,
          "maximumOvernightPassingsPerAvailableDay": 70.43548387096774,
          "maximumTruckPct": 11.685898113475645,
          "maximumCoverageDays": 186,
          "headings": [
            {
              "corridor": "Grieve Parade",
              "corridorSlug": "grieve-parade",
              "sourceSite": "262",
              "headingCode": "S",
              "siteHeadingKey": "262_S",
              "tirtlSiteId": "TIRTL_262",
              "tirtlSiteHeadingId": "TIRTL_262_S",
              "siteName": "Grieve Pde (SB)",
              "siteDescription": "Grieve Pde (SB)",
              "locationLabel": "Grieve Pde (SB)",
              "direction": "southbound",
              "locality": "ALTONA NORTH",
              "lga": "",
              "region": "West",
              "lat": -37.844896,
              "lng": 144.825018,
              "usedInMetric": true,
              "metricStatus": "Used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-22",
              "coverageDays": 186,
              "vehiclePassings": 1154186.0,
              "truckPassings": 134877.0,
              "truckPct": 11.685898113475645,
              "truckPctMethod": "134,877 truck passings ÷ 1,154,186 classified vehicle passings",
              "averageSpeedKmh": null,
              "dayTruckPassings": 113571.0,
              "eveningTruckPassings": 8205.0,
              "nightTruckPassings": 13101.0,
              "overnightPassingsPerAvailableDay": 70.43548387096774,
              "allTruckPassingsPerAvailableDay": 725.1451612903226,
              "averageMinutesBetweenOvernightPassings": 6.814746965880467,
              "nightShareOfTrucksPct": 9.713294334838409,
              "nightShareOfTrucksMethod": "13,101 overnight truck passings ÷ 134,877 all truck passings",
              "truckShareOfNightTrafficPct": 14.77134352590989,
              "exactSensorReference": "TIRTL source site 262; base site ID TIRTL_262; directional heading S; site-heading ID TIRTL_262_S; site-heading key 262_S; site label Grieve Pde (SB); direction southbound; coordinates -37.844896, 144.825018; locality Altona North; reporting coverage 2025-11-01 to 2026-05-22 (186 days); used in comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_262_S at Grieve Pde (SB) recorded an average of 70.4 classified truck passings per day of available overnight data, equivalent to approximately one recorded truck passing every 6.8 minutes across the eight-hour 22:00–05:59 period. Records were observed on 186 days between 1 November 2025 and 22 May 2026. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "Given the measured heavy-vehicle exposure at TIRTL source site 262 (TIRTL_262_S) on Grieve Pde (SB), what are the current pavement condition rating, last substantial resurfacing date, lighting assessment, five-year maintenance expenditure and funded upgrade status for the road segment surrounding this monitoring location?",
              "coverageDescription": "Records were observed on 186 days between 1 November 2025 and 22 May 2026.",
              "popupStatisticsStatus": "Comparable heading — public statistics verified",
              "popupStatisticsReason": "This directional heading is selected for the published comparable corridor metric, and its displayed statistics were recalculated from raw counts.",
              "rawSampleSummary": "134,877 truck passings among 1,154,186 classified vehicle passings; 13,101 overnight truck passings; 186 observed reporting days.",
              "auditRawTruckPct": 11.685898113475645,
              "auditRawNightShareOfTrucksPct": 9.713294334838409,
              "auditRawOvernightPassingsPerAvailableDay": 70.43548387096774,
              "auditRawAllTruckPassingsPerAvailableDay": 725.1451612903226,
              "auditRawAverageMinutesBetweenOvernightPassings": 6.814746965880467,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099640+10:00",
              "popupStatisticsAuditVersion": "4.4"
            }
          ]
        }
      ]
    },
    {
      "corridor": "A1 / Princes Highway — western section",
      "slug": "a1-princes-highway-western-section",
      "region": "West",
      "roadClass": "Arterial / monitored road corridor",
      "physicalSourceSiteCount": 4,
      "headingCount": 8,
      "usedHeadingCount": 4,
      "meanOvernightPassingsPerAvailableDay": 102.2688028290495,
      "equivalentMinutesBetweenOvernightPassings": 4.6935134344181035,
      "sites": [
        {
          "corridor": "A1 / Princes Highway — western section",
          "corridorSlug": "a1-princes-highway-western-section",
          "sourceSite": "251",
          "siteName": "Princes Hwy and Federation Trail (EB)",
          "siteDescription": "Princes Hwy and Federation Trail (EB)",
          "locality": "BROOKLYN",
          "region": "West",
          "lat": -37.819158,
          "lng": 144.839976,
          "headingCount": 2,
          "usedHeadingCount": 1,
          "hasUsedHeading": true,
          "maximumOvernightPassingsPerAvailableDay": 186.40322580645162,
          "maximumTruckPct": 6.8543138948447035,
          "maximumCoverageDays": 186,
          "headings": [
            {
              "corridor": "A1 / Princes Highway — western section",
              "corridorSlug": "a1-princes-highway-western-section",
              "sourceSite": "251",
              "headingCode": "E",
              "siteHeadingKey": "251_E",
              "tirtlSiteId": "TIRTL_251",
              "tirtlSiteHeadingId": "TIRTL_251_E",
              "siteName": "Princes Hwy and Federation Trail (EB)",
              "siteDescription": "Princes Hwy and Federation Trail (EB)",
              "locationLabel": "Princes Hwy and Federation Trail (EB)",
              "direction": "eastbound",
              "locality": "BROOKLYN",
              "lga": "",
              "region": "West",
              "lat": -37.819158,
              "lng": 144.839976,
              "usedInMetric": true,
              "metricStatus": "Used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-22",
              "coverageDays": 186,
              "vehiclePassings": 4348692.0,
              "truckPassings": 298073.0,
              "truckPct": 6.8543138948447035,
              "truckPctMethod": "298,073 truck passings ÷ 4,348,692 classified vehicle passings",
              "averageSpeedKmh": null,
              "dayTruckPassings": 245012.0,
              "eveningTruckPassings": 18390.0,
              "nightTruckPassings": 34671.0,
              "overnightPassingsPerAvailableDay": 186.40322580645162,
              "allTruckPassingsPerAvailableDay": 1602.5430107526881,
              "averageMinutesBetweenOvernightPassings": 2.5750627325430475,
              "nightShareOfTrucksPct": 11.631714378692468,
              "nightShareOfTrucksMethod": "34,671 overnight truck passings ÷ 298,073 all truck passings",
              "truckShareOfNightTrafficPct": 6.958289598590319,
              "exactSensorReference": "TIRTL source site 251; base site ID TIRTL_251; directional heading E; site-heading ID TIRTL_251_E; site-heading key 251_E; site label Princes Hwy and Federation Trail (EB); direction eastbound; coordinates -37.819158, 144.839976; locality Brooklyn; reporting coverage 2025-11-01 to 2026-05-22 (186 days); used in comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_251_E at Princes Hwy and Federation Trail (EB) recorded an average of 186.4 classified truck passings per day of available overnight data, equivalent to approximately one recorded truck passing every 2.6 minutes across the eight-hour 22:00–05:59 period. Records were observed on 186 days between 1 November 2025 and 22 May 2026. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "Given the measured heavy-vehicle exposure at TIRTL source site 251 (TIRTL_251_E) on Princes Hwy and Federation Trail (EB), what are the current pavement condition rating, last substantial resurfacing date, lighting assessment, five-year maintenance expenditure and funded upgrade status for the road segment surrounding this monitoring location?",
              "coverageDescription": "Records were observed on 186 days between 1 November 2025 and 22 May 2026.",
              "popupStatisticsStatus": "Comparable heading — public statistics verified",
              "popupStatisticsReason": "This directional heading is selected for the published comparable corridor metric, and its displayed statistics were recalculated from raw counts.",
              "rawSampleSummary": "298,073 truck passings among 4,348,692 classified vehicle passings; 34,671 overnight truck passings; 186 observed reporting days.",
              "auditRawTruckPct": 6.8543138948447035,
              "auditRawNightShareOfTrucksPct": 11.631714378692468,
              "auditRawOvernightPassingsPerAvailableDay": 186.40322580645162,
              "auditRawAllTruckPassingsPerAvailableDay": 1602.5430107526881,
              "auditRawAverageMinutesBetweenOvernightPassings": 2.5750627325430475,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099671+10:00",
              "popupStatisticsAuditVersion": "4.4"
            },
            {
              "corridor": "A1 / Princes Highway — western section",
              "corridorSlug": "a1-princes-highway-western-section",
              "sourceSite": "251",
              "headingCode": "W",
              "siteHeadingKey": "251_W",
              "tirtlSiteId": "TIRTL_251",
              "tirtlSiteHeadingId": "TIRTL_251_W",
              "siteName": "Princes Hwy and Federation Trail source-site location",
              "siteDescription": "Princes Hwy and Federation Trail source-site location",
              "locationLabel": "Princes Hwy and Federation Trail source-site location",
              "direction": "westbound",
              "locality": "BROOKLYN",
              "lga": "",
              "region": "West",
              "lat": -37.819158,
              "lng": 144.839976,
              "usedInMetric": false,
              "metricStatus": "Present at same source-site ID; not used in comparable valid-night metric",
              "firstDate": "2025-11-05",
              "lastDate": "2026-04-12",
              "coverageDays": 11,
              "vehiclePassings": 17.0,
              "truckPassings": 1.0,
              "truckPct": null,
              "truckPctMethod": "Not shown publicly — non-contributing heading",
              "averageSpeedKmh": null,
              "dayTruckPassings": 0.0,
              "eveningTruckPassings": 1.0,
              "nightTruckPassings": 0.0,
              "overnightPassingsPerAvailableDay": null,
              "allTruckPassingsPerAvailableDay": null,
              "averageMinutesBetweenOvernightPassings": null,
              "nightShareOfTrucksPct": null,
              "nightShareOfTrucksMethod": "Not shown publicly — non-contributing heading",
              "truckShareOfNightTrafficPct": 0.0,
              "exactSensorReference": "TIRTL source-site ID 251; base site ID TIRTL_251; directional heading W; site-heading ID TIRTL_251_W; site-heading key 251_W; neutral source-site label Princes Hwy and Federation Trail source-site location; direction westbound; coordinates -37.819158, 144.839976; locality Brooklyn; records observed 2025-11-05 to 2026-04-12 (11 days); not used in the comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_251_W is a secondary or sparse westbound heading at the Princes Hwy and Federation Trail source-site location. It was not used in the comparable corridor metric. 1 truck passings among 17 classified vehicle passings; 0 overnight truck passings; 11 observed reporting days. No comparable freight conclusion should be drawn from this record. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "TIRTL_251_W is not used in the comparable corridor metric. Infrastructure accountability questions should be based on the contributing heading or headings at TIRTL source site 251.",
              "coverageDescription": "Records were observed on 11 days between 5 November 2025 and 12 April 2026.",
              "popupStatisticsStatus": "Not used in comparable corridor metric",
              "popupStatisticsReason": "Percentages and frequency are withheld from the public popup because this is a secondary or sparse heading record, not a contributing comparison heading.",
              "rawSampleSummary": "1 truck passings among 17 classified vehicle passings; 0 overnight truck passings; 11 observed reporting days.",
              "auditRawTruckPct": 5.88235294117647,
              "auditRawNightShareOfTrucksPct": 0.0,
              "auditRawOvernightPassingsPerAvailableDay": 0.0,
              "auditRawAllTruckPassingsPerAvailableDay": 0.09090909090909091,
              "auditRawAverageMinutesBetweenOvernightPassings": null,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099701+10:00",
              "popupStatisticsAuditVersion": "4.4",
              "originalSourceSiteLabel": "Princes Hwy and Federation Trail (EB)",
              "publicLocationLabel": "Princes Hwy and Federation Trail source-site location",
              "publicLabelPolicy": "Neutral source-site location used because the source-site name carries the principal heading direction, while this secondary record has the opposite direction."
            }
          ]
        },
        {
          "corridor": "A1 / Princes Highway — western section",
          "corridorSlug": "a1-princes-highway-western-section",
          "sourceSite": "252",
          "siteName": "Princes Hwy and Federation Trail (WB)",
          "siteDescription": "Princes Hwy and Federation Trail (WB)",
          "locality": "BROOKLYN",
          "region": "West",
          "lat": -37.819396,
          "lng": 144.840129,
          "headingCount": 2,
          "usedHeadingCount": 1,
          "hasUsedHeading": true,
          "maximumOvernightPassingsPerAvailableDay": 155.66129032258064,
          "maximumTruckPct": 6.416415985516795,
          "maximumCoverageDays": 186,
          "headings": [
            {
              "corridor": "A1 / Princes Highway — western section",
              "corridorSlug": "a1-princes-highway-western-section",
              "sourceSite": "252",
              "headingCode": "W",
              "siteHeadingKey": "252_W",
              "tirtlSiteId": "TIRTL_252",
              "tirtlSiteHeadingId": "TIRTL_252_W",
              "siteName": "Princes Hwy and Federation Trail (WB)",
              "siteDescription": "Princes Hwy and Federation Trail (WB)",
              "locationLabel": "Princes Hwy and Federation Trail (WB)",
              "direction": "westbound",
              "locality": "BROOKLYN",
              "lga": "",
              "region": "West",
              "lat": -37.819396,
              "lng": 144.840129,
              "usedInMetric": true,
              "metricStatus": "Used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-22",
              "coverageDays": 186,
              "vehiclePassings": 4111797.0,
              "truckPassings": 263830.0,
              "truckPct": 6.416415985516795,
              "truckPctMethod": "263,830 truck passings ÷ 4,111,797 classified vehicle passings",
              "averageSpeedKmh": null,
              "dayTruckPassings": 215553.0,
              "eveningTruckPassings": 19324.0,
              "nightTruckPassings": 28953.0,
              "overnightPassingsPerAvailableDay": 155.66129032258064,
              "allTruckPassingsPerAvailableDay": 1418.4408602150538,
              "averageMinutesBetweenOvernightPassings": 3.0836182778986636,
              "nightShareOfTrucksPct": 10.974112117651517,
              "nightShareOfTrucksMethod": "28,953 overnight truck passings ÷ 263,830 all truck passings",
              "truckShareOfNightTrafficPct": 4.796775310515529,
              "exactSensorReference": "TIRTL source site 252; base site ID TIRTL_252; directional heading W; site-heading ID TIRTL_252_W; site-heading key 252_W; site label Princes Hwy and Federation Trail (WB); direction westbound; coordinates -37.819396, 144.840129; locality Brooklyn; reporting coverage 2025-11-01 to 2026-05-22 (186 days); used in comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_252_W at Princes Hwy and Federation Trail (WB) recorded an average of 155.7 classified truck passings per day of available overnight data, equivalent to approximately one recorded truck passing every 3.1 minutes across the eight-hour 22:00–05:59 period. Records were observed on 186 days between 1 November 2025 and 22 May 2026. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "Given the measured heavy-vehicle exposure at TIRTL source site 252 (TIRTL_252_W) on Princes Hwy and Federation Trail (WB), what are the current pavement condition rating, last substantial resurfacing date, lighting assessment, five-year maintenance expenditure and funded upgrade status for the road segment surrounding this monitoring location?",
              "coverageDescription": "Records were observed on 186 days between 1 November 2025 and 22 May 2026.",
              "popupStatisticsStatus": "Comparable heading — public statistics verified",
              "popupStatisticsReason": "This directional heading is selected for the published comparable corridor metric, and its displayed statistics were recalculated from raw counts.",
              "rawSampleSummary": "263,830 truck passings among 4,111,797 classified vehicle passings; 28,953 overnight truck passings; 186 observed reporting days.",
              "auditRawTruckPct": 6.416415985516795,
              "auditRawNightShareOfTrucksPct": 10.974112117651517,
              "auditRawOvernightPassingsPerAvailableDay": 155.66129032258064,
              "auditRawAllTruckPassingsPerAvailableDay": 1418.4408602150538,
              "auditRawAverageMinutesBetweenOvernightPassings": 3.0836182778986636,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099738+10:00",
              "popupStatisticsAuditVersion": "4.4"
            },
            {
              "corridor": "A1 / Princes Highway — western section",
              "corridorSlug": "a1-princes-highway-western-section",
              "sourceSite": "252",
              "headingCode": "E",
              "siteHeadingKey": "252_E",
              "tirtlSiteId": "TIRTL_252",
              "tirtlSiteHeadingId": "TIRTL_252_E",
              "siteName": "Princes Hwy and Federation Trail source-site location",
              "siteDescription": "Princes Hwy and Federation Trail source-site location",
              "locationLabel": "Princes Hwy and Federation Trail source-site location",
              "direction": "eastbound",
              "locality": "BROOKLYN",
              "lga": "",
              "region": "West",
              "lat": -37.819396,
              "lng": 144.840129,
              "usedInMetric": false,
              "metricStatus": "Present at same source-site ID; not used in comparable valid-night metric",
              "firstDate": "2025-11-14",
              "lastDate": "2026-04-02",
              "coverageDays": 3,
              "vehiclePassings": 3.0,
              "truckPassings": 0.0,
              "truckPct": null,
              "truckPctMethod": "Not shown publicly — non-contributing heading",
              "averageSpeedKmh": null,
              "dayTruckPassings": 0.0,
              "eveningTruckPassings": 0.0,
              "nightTruckPassings": 0.0,
              "overnightPassingsPerAvailableDay": null,
              "allTruckPassingsPerAvailableDay": null,
              "averageMinutesBetweenOvernightPassings": null,
              "nightShareOfTrucksPct": null,
              "nightShareOfTrucksMethod": "Not shown publicly — non-contributing heading",
              "truckShareOfNightTrafficPct": 0.0,
              "exactSensorReference": "TIRTL source-site ID 252; base site ID TIRTL_252; directional heading E; site-heading ID TIRTL_252_E; site-heading key 252_E; neutral source-site label Princes Hwy and Federation Trail source-site location; direction eastbound; coordinates -37.819396, 144.840129; locality Brooklyn; records observed 2025-11-14 to 2026-04-02 (3 days); not used in the comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_252_E is a secondary or sparse eastbound heading at the Princes Hwy and Federation Trail source-site location. It was not used in the comparable corridor metric. 0 truck passings among 3 classified vehicle passings; 0 overnight truck passings; 3 observed reporting days. No comparable freight conclusion should be drawn from this record. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "TIRTL_252_E is not used in the comparable corridor metric. Infrastructure accountability questions should be based on the contributing heading or headings at TIRTL source site 252.",
              "coverageDescription": "Records were observed on 3 days between 14 November 2025 and 2 April 2026.",
              "popupStatisticsStatus": "Not used in comparable corridor metric",
              "popupStatisticsReason": "Percentages and frequency are withheld from the public popup because this is a secondary or sparse heading record, not a contributing comparison heading.",
              "rawSampleSummary": "0 truck passings among 3 classified vehicle passings; 0 overnight truck passings; 3 observed reporting days.",
              "auditRawTruckPct": 0.0,
              "auditRawNightShareOfTrucksPct": null,
              "auditRawOvernightPassingsPerAvailableDay": 0.0,
              "auditRawAllTruckPassingsPerAvailableDay": 0.0,
              "auditRawAverageMinutesBetweenOvernightPassings": null,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099768+10:00",
              "popupStatisticsAuditVersion": "4.4",
              "originalSourceSiteLabel": "Princes Hwy and Federation Trail (WB)",
              "publicLocationLabel": "Princes Hwy and Federation Trail source-site location",
              "publicLabelPolicy": "Neutral source-site location used because the source-site name carries the principal heading direction, while this secondary record has the opposite direction."
            }
          ]
        },
        {
          "corridor": "A1 / Princes Highway — western section",
          "corridorSlug": "a1-princes-highway-western-section",
          "sourceSite": "257",
          "siteName": "Princes Hwy West (EB)",
          "siteDescription": "Princes Hwy West (EB)",
          "locality": "WERRIBEE",
          "region": "West",
          "lat": -37.885667,
          "lng": 144.697972,
          "headingCount": 2,
          "usedHeadingCount": 1,
          "hasUsedHeading": true,
          "maximumOvernightPassingsPerAvailableDay": 30.90909090909091,
          "maximumTruckPct": 1.0365647212854816,
          "maximumCoverageDays": 187,
          "headings": [
            {
              "corridor": "A1 / Princes Highway — western section",
              "corridorSlug": "a1-princes-highway-western-section",
              "sourceSite": "257",
              "headingCode": "E",
              "siteHeadingKey": "257_E",
              "tirtlSiteId": "TIRTL_257",
              "tirtlSiteHeadingId": "TIRTL_257_E",
              "siteName": "Princes Hwy West (EB)",
              "siteDescription": "Princes Hwy West (EB)",
              "locationLabel": "Princes Hwy West (EB)",
              "direction": "eastbound",
              "locality": "WERRIBEE",
              "lga": "",
              "region": "West",
              "lat": -37.885667,
              "lng": 144.697972,
              "usedInMetric": true,
              "metricStatus": "Used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-22",
              "coverageDays": 187,
              "vehiclePassings": 3198739.0,
              "truckPassings": 33157.0,
              "truckPct": 1.0365647212854816,
              "truckPctMethod": "33,157 truck passings ÷ 3,198,739 classified vehicle passings",
              "averageSpeedKmh": null,
              "dayTruckPassings": 24543.0,
              "eveningTruckPassings": 2834.0,
              "nightTruckPassings": 5780.0,
              "overnightPassingsPerAvailableDay": 30.90909090909091,
              "allTruckPassingsPerAvailableDay": 177.3101604278075,
              "averageMinutesBetweenOvernightPassings": 15.529411764705882,
              "nightShareOfTrucksPct": 17.432216424887656,
              "nightShareOfTrucksMethod": "5,780 overnight truck passings ÷ 33,157 all truck passings",
              "truckShareOfNightTrafficPct": 1.3140962973404329,
              "exactSensorReference": "TIRTL source site 257; base site ID TIRTL_257; directional heading E; site-heading ID TIRTL_257_E; site-heading key 257_E; site label Princes Hwy West (EB); direction eastbound; coordinates -37.885667, 144.697972; locality Werribee; reporting coverage 2025-11-01 to 2026-05-22 (187 days); used in comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_257_E at Princes Hwy West (EB) recorded an average of 30.9 classified truck passings per day of available overnight data, equivalent to approximately one recorded truck passing every 15.5 minutes across the eight-hour 22:00–05:59 period. Records were observed on 187 days between 1 November 2025 and 22 May 2026. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "Given the measured heavy-vehicle exposure at TIRTL source site 257 (TIRTL_257_E) on Princes Hwy West (EB), what are the current pavement condition rating, last substantial resurfacing date, lighting assessment, five-year maintenance expenditure and funded upgrade status for the road segment surrounding this monitoring location?",
              "coverageDescription": "Records were observed on 187 days between 1 November 2025 and 22 May 2026.",
              "popupStatisticsStatus": "Comparable heading — public statistics verified",
              "popupStatisticsReason": "This directional heading is selected for the published comparable corridor metric, and its displayed statistics were recalculated from raw counts.",
              "rawSampleSummary": "33,157 truck passings among 3,198,739 classified vehicle passings; 5,780 overnight truck passings; 187 observed reporting days.",
              "auditRawTruckPct": 1.0365647212854816,
              "auditRawNightShareOfTrucksPct": 17.432216424887656,
              "auditRawOvernightPassingsPerAvailableDay": 30.90909090909091,
              "auditRawAllTruckPassingsPerAvailableDay": 177.3101604278075,
              "auditRawAverageMinutesBetweenOvernightPassings": 15.529411764705882,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099807+10:00",
              "popupStatisticsAuditVersion": "4.4"
            },
            {
              "corridor": "A1 / Princes Highway — western section",
              "corridorSlug": "a1-princes-highway-western-section",
              "sourceSite": "257",
              "headingCode": "W",
              "siteHeadingKey": "257_W",
              "tirtlSiteId": "TIRTL_257",
              "tirtlSiteHeadingId": "TIRTL_257_W",
              "siteName": "Princes Hwy West source-site location",
              "siteDescription": "Princes Hwy West source-site location",
              "locationLabel": "Princes Hwy West source-site location",
              "direction": "westbound",
              "locality": "WERRIBEE",
              "lga": "",
              "region": "West",
              "lat": -37.885667,
              "lng": 144.697972,
              "usedInMetric": false,
              "metricStatus": "Present at same source-site ID; not used in comparable valid-night metric",
              "firstDate": "2025-11-14",
              "lastDate": "2026-05-17",
              "coverageDays": 6,
              "vehiclePassings": 6.0,
              "truckPassings": 0.0,
              "truckPct": null,
              "truckPctMethod": "Not shown publicly — non-contributing heading",
              "averageSpeedKmh": null,
              "dayTruckPassings": 0.0,
              "eveningTruckPassings": 0.0,
              "nightTruckPassings": 0.0,
              "overnightPassingsPerAvailableDay": null,
              "allTruckPassingsPerAvailableDay": null,
              "averageMinutesBetweenOvernightPassings": null,
              "nightShareOfTrucksPct": null,
              "nightShareOfTrucksMethod": "Not shown publicly — non-contributing heading",
              "truckShareOfNightTrafficPct": 0.0,
              "exactSensorReference": "TIRTL source-site ID 257; base site ID TIRTL_257; directional heading W; site-heading ID TIRTL_257_W; site-heading key 257_W; neutral source-site label Princes Hwy West source-site location; direction westbound; coordinates -37.885667, 144.697972; locality Werribee; records observed 2025-11-14 to 2026-05-17 (6 days); not used in the comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_257_W is a secondary or sparse westbound heading at the Princes Hwy West source-site location. It was not used in the comparable corridor metric. 0 truck passings among 6 classified vehicle passings; 0 overnight truck passings; 6 observed reporting days. No comparable freight conclusion should be drawn from this record. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "TIRTL_257_W is not used in the comparable corridor metric. Infrastructure accountability questions should be based on the contributing heading or headings at TIRTL source site 257.",
              "coverageDescription": "Records were observed on 6 days between 14 November 2025 and 17 May 2026.",
              "popupStatisticsStatus": "Not used in comparable corridor metric",
              "popupStatisticsReason": "Percentages and frequency are withheld from the public popup because this is a secondary or sparse heading record, not a contributing comparison heading.",
              "rawSampleSummary": "0 truck passings among 6 classified vehicle passings; 0 overnight truck passings; 6 observed reporting days.",
              "auditRawTruckPct": 0.0,
              "auditRawNightShareOfTrucksPct": null,
              "auditRawOvernightPassingsPerAvailableDay": 0.0,
              "auditRawAllTruckPassingsPerAvailableDay": 0.0,
              "auditRawAverageMinutesBetweenOvernightPassings": null,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099836+10:00",
              "popupStatisticsAuditVersion": "4.4",
              "originalSourceSiteLabel": "Princes Hwy West (EB)",
              "publicLocationLabel": "Princes Hwy West source-site location",
              "publicLabelPolicy": "Neutral source-site location used because the source-site name carries the principal heading direction, while this secondary record has the opposite direction."
            }
          ]
        },
        {
          "corridor": "A1 / Princes Highway — western section",
          "corridorSlug": "a1-princes-highway-western-section",
          "sourceSite": "258",
          "siteName": "Princes Hwy West (WB)",
          "siteDescription": "Princes Hwy West (WB)",
          "locality": "WERRIBEE",
          "region": "West",
          "lat": -37.885494,
          "lng": 144.698902,
          "headingCount": 2,
          "usedHeadingCount": 1,
          "hasUsedHeading": true,
          "maximumOvernightPassingsPerAvailableDay": 36.101604278074866,
          "maximumTruckPct": 1.2194341778887956,
          "maximumCoverageDays": 187,
          "headings": [
            {
              "corridor": "A1 / Princes Highway — western section",
              "corridorSlug": "a1-princes-highway-western-section",
              "sourceSite": "258",
              "headingCode": "W",
              "siteHeadingKey": "258_W",
              "tirtlSiteId": "TIRTL_258",
              "tirtlSiteHeadingId": "TIRTL_258_W",
              "siteName": "Princes Hwy West (WB)",
              "siteDescription": "Princes Hwy West (WB)",
              "locationLabel": "Princes Hwy West (WB)",
              "direction": "westbound",
              "locality": "WERRIBEE",
              "lga": "",
              "region": "West",
              "lat": -37.885494,
              "lng": 144.698902,
              "usedInMetric": true,
              "metricStatus": "Used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-22",
              "coverageDays": 187,
              "vehiclePassings": 3438890.0,
              "truckPassings": 41935.0,
              "truckPct": 1.2194341778887956,
              "truckPctMethod": "41,935 truck passings ÷ 3,438,890 classified vehicle passings",
              "averageSpeedKmh": null,
              "dayTruckPassings": 31370.0,
              "eveningTruckPassings": 3814.0,
              "nightTruckPassings": 6751.0,
              "overnightPassingsPerAvailableDay": 36.101604278074866,
              "allTruckPassingsPerAvailableDay": 224.25133689839572,
              "averageMinutesBetweenOvernightPassings": 13.29580802844023,
              "nightShareOfTrucksPct": 16.098724216048645,
              "nightShareOfTrucksMethod": "6,751 overnight truck passings ÷ 41,935 all truck passings",
              "truckShareOfNightTrafficPct": 1.7728047393837856,
              "exactSensorReference": "TIRTL source site 258; base site ID TIRTL_258; directional heading W; site-heading ID TIRTL_258_W; site-heading key 258_W; site label Princes Hwy West (WB); direction westbound; coordinates -37.885494, 144.698902; locality Werribee; reporting coverage 2025-11-01 to 2026-05-22 (187 days); used in comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_258_W at Princes Hwy West (WB) recorded an average of 36.1 classified truck passings per day of available overnight data, equivalent to approximately one recorded truck passing every 13.3 minutes across the eight-hour 22:00–05:59 period. Records were observed on 187 days between 1 November 2025 and 22 May 2026. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "Given the measured heavy-vehicle exposure at TIRTL source site 258 (TIRTL_258_W) on Princes Hwy West (WB), what are the current pavement condition rating, last substantial resurfacing date, lighting assessment, five-year maintenance expenditure and funded upgrade status for the road segment surrounding this monitoring location?",
              "coverageDescription": "Records were observed on 187 days between 1 November 2025 and 22 May 2026.",
              "popupStatisticsStatus": "Comparable heading — public statistics verified",
              "popupStatisticsReason": "This directional heading is selected for the published comparable corridor metric, and its displayed statistics were recalculated from raw counts.",
              "rawSampleSummary": "41,935 truck passings among 3,438,890 classified vehicle passings; 6,751 overnight truck passings; 187 observed reporting days.",
              "auditRawTruckPct": 1.2194341778887956,
              "auditRawNightShareOfTrucksPct": 16.098724216048645,
              "auditRawOvernightPassingsPerAvailableDay": 36.101604278074866,
              "auditRawAllTruckPassingsPerAvailableDay": 224.25133689839572,
              "auditRawAverageMinutesBetweenOvernightPassings": 13.29580802844023,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099890+10:00",
              "popupStatisticsAuditVersion": "4.4"
            },
            {
              "corridor": "A1 / Princes Highway — western section",
              "corridorSlug": "a1-princes-highway-western-section",
              "sourceSite": "258",
              "headingCode": "E",
              "siteHeadingKey": "258_E",
              "tirtlSiteId": "TIRTL_258",
              "tirtlSiteHeadingId": "TIRTL_258_E",
              "siteName": "Princes Hwy West source-site location",
              "siteDescription": "Princes Hwy West source-site location",
              "locationLabel": "Princes Hwy West source-site location",
              "direction": "eastbound",
              "locality": "WERRIBEE",
              "lga": "",
              "region": "West",
              "lat": -37.885494,
              "lng": 144.698902,
              "usedInMetric": false,
              "metricStatus": "Present at same source-site ID; not used in comparable valid-night metric",
              "firstDate": "2026-05-12",
              "lastDate": "2026-05-17",
              "coverageDays": 2,
              "vehiclePassings": 3.0,
              "truckPassings": 0.0,
              "truckPct": null,
              "truckPctMethod": "Not shown publicly — non-contributing heading",
              "averageSpeedKmh": null,
              "dayTruckPassings": 0.0,
              "eveningTruckPassings": 0.0,
              "nightTruckPassings": 0.0,
              "overnightPassingsPerAvailableDay": null,
              "allTruckPassingsPerAvailableDay": null,
              "averageMinutesBetweenOvernightPassings": null,
              "nightShareOfTrucksPct": null,
              "nightShareOfTrucksMethod": "Not shown publicly — non-contributing heading",
              "truckShareOfNightTrafficPct": 0.0,
              "exactSensorReference": "TIRTL source-site ID 258; base site ID TIRTL_258; directional heading E; site-heading ID TIRTL_258_E; site-heading key 258_E; neutral source-site label Princes Hwy West source-site location; direction eastbound; coordinates -37.885494, 144.698902; locality Werribee; records observed 2026-05-12 to 2026-05-17 (2 days); not used in the comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_258_E is a secondary or sparse eastbound heading at the Princes Hwy West source-site location. It was not used in the comparable corridor metric. 0 truck passings among 3 classified vehicle passings; 0 overnight truck passings; 2 observed reporting days. No comparable freight conclusion should be drawn from this record. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "TIRTL_258_E is not used in the comparable corridor metric. Infrastructure accountability questions should be based on the contributing heading or headings at TIRTL source site 258.",
              "coverageDescription": "Records were observed on 2 days between 12 May 2026 and 17 May 2026.",
              "popupStatisticsStatus": "Not used in comparable corridor metric",
              "popupStatisticsReason": "Percentages and frequency are withheld from the public popup because this is a secondary or sparse heading record, not a contributing comparison heading.",
              "rawSampleSummary": "0 truck passings among 3 classified vehicle passings; 0 overnight truck passings; 2 observed reporting days.",
              "auditRawTruckPct": 0.0,
              "auditRawNightShareOfTrucksPct": null,
              "auditRawOvernightPassingsPerAvailableDay": 0.0,
              "auditRawAllTruckPassingsPerAvailableDay": 0.0,
              "auditRawAverageMinutesBetweenOvernightPassings": null,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099919+10:00",
              "popupStatisticsAuditVersion": "4.4",
              "originalSourceSiteLabel": "Princes Hwy West (WB)",
              "publicLocationLabel": "Princes Hwy West source-site location",
              "publicLabelPolicy": "Neutral source-site location used because the source-site name carries the principal heading direction, while this secondary record has the opposite direction."
            }
          ]
        }
      ]
    },
    {
      "corridor": "Sneydes Road",
      "slug": "sneydes-road",
      "region": "West",
      "roadClass": "Arterial / monitored road corridor",
      "physicalSourceSiteCount": 2,
      "headingCount": 4,
      "usedHeadingCount": 2,
      "meanOvernightPassingsPerAvailableDay": 4.701380412670735,
      "equivalentMinutesBetweenOvernightPassings": 102.097672995435,
      "sites": [
        {
          "corridor": "Sneydes Road",
          "corridorSlug": "sneydes-road",
          "sourceSite": "259",
          "siteName": "Sneydes Rd (EB)",
          "siteDescription": "Sneydes Rd (EB)",
          "locality": "POINT COOK",
          "region": "West",
          "lat": -37.897503,
          "lng": 144.712346,
          "headingCount": 2,
          "usedHeadingCount": 1,
          "hasUsedHeading": true,
          "maximumOvernightPassingsPerAvailableDay": 4.489247311827957,
          "maximumTruckPct": 0.6623500191092347,
          "maximumCoverageDays": 186,
          "headings": [
            {
              "corridor": "Sneydes Road",
              "corridorSlug": "sneydes-road",
              "sourceSite": "259",
              "headingCode": "E",
              "siteHeadingKey": "259_E",
              "tirtlSiteId": "TIRTL_259",
              "tirtlSiteHeadingId": "TIRTL_259_E",
              "siteName": "Sneydes Rd (EB)",
              "siteDescription": "Sneydes Rd (EB)",
              "locationLabel": "Sneydes Rd (EB)",
              "direction": "eastbound",
              "locality": "POINT COOK",
              "lga": "",
              "region": "West",
              "lat": -37.897503,
              "lng": 144.712346,
              "usedInMetric": true,
              "metricStatus": "Used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-22",
              "coverageDays": 186,
              "vehiclePassings": 2255454.0,
              "truckPassings": 14939.0,
              "truckPct": 0.6623500191092347,
              "truckPctMethod": "14,939 truck passings ÷ 2,255,454 classified vehicle passings",
              "averageSpeedKmh": null,
              "dayTruckPassings": 13337.0,
              "eveningTruckPassings": 767.0,
              "nightTruckPassings": 835.0,
              "overnightPassingsPerAvailableDay": 4.489247311827957,
              "allTruckPassingsPerAvailableDay": 80.31720430107526,
              "averageMinutesBetweenOvernightPassings": 106.92215568862275,
              "nightShareOfTrucksPct": 5.589396880647969,
              "nightShareOfTrucksMethod": "835 overnight truck passings ÷ 14,939 all truck passings",
              "truckShareOfNightTrafficPct": 51.74507956967924,
              "exactSensorReference": "TIRTL source site 259; base site ID TIRTL_259; directional heading E; site-heading ID TIRTL_259_E; site-heading key 259_E; site label Sneydes Rd (EB); direction eastbound; coordinates -37.897503, 144.712346; locality Point Cook; reporting coverage 2025-11-01 to 2026-05-22 (186 days); used in comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_259_E at Sneydes Rd (EB) recorded an average of 4.5 classified truck passings per day of available overnight data, equivalent to approximately one recorded truck passing every 106.9 minutes across the eight-hour 22:00–05:59 period. Records were observed on 186 days between 1 November 2025 and 22 May 2026. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "Given the measured heavy-vehicle exposure at TIRTL source site 259 (TIRTL_259_E) on Sneydes Rd (EB), what are the current pavement condition rating, last substantial resurfacing date, lighting assessment, five-year maintenance expenditure and funded upgrade status for the road segment surrounding this monitoring location?",
              "coverageDescription": "Records were observed on 186 days between 1 November 2025 and 22 May 2026.",
              "popupStatisticsStatus": "Comparable heading — public statistics verified",
              "popupStatisticsReason": "This directional heading is selected for the published comparable corridor metric, and its displayed statistics were recalculated from raw counts.",
              "rawSampleSummary": "14,939 truck passings among 2,255,454 classified vehicle passings; 835 overnight truck passings; 186 observed reporting days.",
              "auditRawTruckPct": 0.6623500191092347,
              "auditRawNightShareOfTrucksPct": 5.589396880647969,
              "auditRawOvernightPassingsPerAvailableDay": 4.489247311827957,
              "auditRawAllTruckPassingsPerAvailableDay": 80.31720430107526,
              "auditRawAverageMinutesBetweenOvernightPassings": 106.92215568862275,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099954+10:00",
              "popupStatisticsAuditVersion": "4.4"
            },
            {
              "corridor": "Sneydes Road",
              "corridorSlug": "sneydes-road",
              "sourceSite": "259",
              "headingCode": "W",
              "siteHeadingKey": "259_W",
              "tirtlSiteId": "TIRTL_259",
              "tirtlSiteHeadingId": "TIRTL_259_W",
              "siteName": "Sneydes Rd source-site location",
              "siteDescription": "Sneydes Rd source-site location",
              "locationLabel": "Sneydes Rd source-site location",
              "direction": "westbound",
              "locality": "POINT COOK",
              "lga": "",
              "region": "West",
              "lat": -37.897503,
              "lng": 144.712346,
              "usedInMetric": false,
              "metricStatus": "Present at same source-site ID; not used in comparable valid-night metric",
              "firstDate": "2025-12-19",
              "lastDate": "2026-03-03",
              "coverageDays": 2,
              "vehiclePassings": 2.0,
              "truckPassings": 0.0,
              "truckPct": null,
              "truckPctMethod": "Not shown publicly — non-contributing heading",
              "averageSpeedKmh": null,
              "dayTruckPassings": 0.0,
              "eveningTruckPassings": 0.0,
              "nightTruckPassings": 0.0,
              "overnightPassingsPerAvailableDay": null,
              "allTruckPassingsPerAvailableDay": null,
              "averageMinutesBetweenOvernightPassings": null,
              "nightShareOfTrucksPct": null,
              "nightShareOfTrucksMethod": "Not shown publicly — non-contributing heading",
              "truckShareOfNightTrafficPct": 0.0,
              "exactSensorReference": "TIRTL source-site ID 259; base site ID TIRTL_259; directional heading W; site-heading ID TIRTL_259_W; site-heading key 259_W; neutral source-site label Sneydes Rd source-site location; direction westbound; coordinates -37.897503, 144.712346; locality Point Cook; records observed 2025-12-19 to 2026-03-03 (2 days); not used in the comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_259_W is a secondary or sparse westbound heading at the Sneydes Rd source-site location. It was not used in the comparable corridor metric. 0 truck passings among 2 classified vehicle passings; 0 overnight truck passings; 2 observed reporting days. No comparable freight conclusion should be drawn from this record. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "TIRTL_259_W is not used in the comparable corridor metric. Infrastructure accountability questions should be based on the contributing heading or headings at TIRTL source site 259.",
              "coverageDescription": "Records were observed on 2 days between 19 December 2025 and 3 March 2026.",
              "popupStatisticsStatus": "Not used in comparable corridor metric",
              "popupStatisticsReason": "Percentages and frequency are withheld from the public popup because this is a secondary or sparse heading record, not a contributing comparison heading.",
              "rawSampleSummary": "0 truck passings among 2 classified vehicle passings; 0 overnight truck passings; 2 observed reporting days.",
              "auditRawTruckPct": 0.0,
              "auditRawNightShareOfTrucksPct": null,
              "auditRawOvernightPassingsPerAvailableDay": 0.0,
              "auditRawAllTruckPassingsPerAvailableDay": 0.0,
              "auditRawAverageMinutesBetweenOvernightPassings": null,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.099979+10:00",
              "popupStatisticsAuditVersion": "4.4",
              "originalSourceSiteLabel": "Sneydes Rd (EB)",
              "publicLocationLabel": "Sneydes Rd source-site location",
              "publicLabelPolicy": "Neutral source-site location used because the source-site name carries the principal heading direction, while this secondary record has the opposite direction."
            }
          ]
        },
        {
          "corridor": "Sneydes Road",
          "corridorSlug": "sneydes-road",
          "sourceSite": "260",
          "siteName": "Sneydes Rd (WB)",
          "siteDescription": "Sneydes Rd (WB)",
          "locality": "POINT COOK",
          "region": "West",
          "lat": -37.897545,
          "lng": 144.712445,
          "headingCount": 2,
          "usedHeadingCount": 1,
          "hasUsedHeading": true,
          "maximumOvernightPassingsPerAvailableDay": 4.9135135135135135,
          "maximumTruckPct": 0.665429786714514,
          "maximumCoverageDays": 185,
          "headings": [
            {
              "corridor": "Sneydes Road",
              "corridorSlug": "sneydes-road",
              "sourceSite": "260",
              "headingCode": "W",
              "siteHeadingKey": "260_W",
              "tirtlSiteId": "TIRTL_260",
              "tirtlSiteHeadingId": "TIRTL_260_W",
              "siteName": "Sneydes Rd (WB)",
              "siteDescription": "Sneydes Rd (WB)",
              "locationLabel": "Sneydes Rd (WB)",
              "direction": "westbound",
              "locality": "POINT COOK",
              "lga": "",
              "region": "West",
              "lat": -37.897545,
              "lng": 144.712445,
              "usedInMetric": true,
              "metricStatus": "Used in comparable valid-night metric",
              "firstDate": "2025-11-01",
              "lastDate": "2026-05-22",
              "coverageDays": 185,
              "vehiclePassings": 2293405.0,
              "truckPassings": 15261.0,
              "truckPct": 0.665429786714514,
              "truckPctMethod": "15,261 truck passings ÷ 2,293,405 classified vehicle passings",
              "averageSpeedKmh": null,
              "dayTruckPassings": 13615.0,
              "eveningTruckPassings": 737.0,
              "nightTruckPassings": 909.0,
              "overnightPassingsPerAvailableDay": 4.9135135135135135,
              "allTruckPassingsPerAvailableDay": 82.4918918918919,
              "averageMinutesBetweenOvernightPassings": 97.6897689768977,
              "nightShareOfTrucksPct": 5.956359347356006,
              "nightShareOfTrucksMethod": "909 overnight truck passings ÷ 15,261 all truck passings",
              "truckShareOfNightTrafficPct": 62.92050834786942,
              "exactSensorReference": "TIRTL source site 260; base site ID TIRTL_260; directional heading W; site-heading ID TIRTL_260_W; site-heading key 260_W; site label Sneydes Rd (WB); direction westbound; coordinates -37.897545, 144.712445; locality Point Cook; reporting coverage 2025-11-01 to 2026-05-22 (185 days); used in comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_260_W at Sneydes Rd (WB) recorded an average of 4.9 classified truck passings per day of available overnight data, equivalent to approximately one recorded truck passing every 97.7 minutes across the eight-hour 22:00–05:59 period. Records were observed on 185 days between 1 November 2025 and 22 May 2026. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "Given the measured heavy-vehicle exposure at TIRTL source site 260 (TIRTL_260_W) on Sneydes Rd (WB), what are the current pavement condition rating, last substantial resurfacing date, lighting assessment, five-year maintenance expenditure and funded upgrade status for the road segment surrounding this monitoring location?",
              "coverageDescription": "Records were observed on 185 days between 1 November 2025 and 22 May 2026.",
              "popupStatisticsStatus": "Comparable heading — public statistics verified",
              "popupStatisticsReason": "This directional heading is selected for the published comparable corridor metric, and its displayed statistics were recalculated from raw counts.",
              "rawSampleSummary": "15,261 truck passings among 2,293,405 classified vehicle passings; 909 overnight truck passings; 185 observed reporting days.",
              "auditRawTruckPct": 0.665429786714514,
              "auditRawNightShareOfTrucksPct": 5.956359347356006,
              "auditRawOvernightPassingsPerAvailableDay": 4.9135135135135135,
              "auditRawAllTruckPassingsPerAvailableDay": 82.4918918918919,
              "auditRawAverageMinutesBetweenOvernightPassings": 97.6897689768977,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.100011+10:00",
              "popupStatisticsAuditVersion": "4.4"
            },
            {
              "corridor": "Sneydes Road",
              "corridorSlug": "sneydes-road",
              "sourceSite": "260",
              "headingCode": "E",
              "siteHeadingKey": "260_E",
              "tirtlSiteId": "TIRTL_260",
              "tirtlSiteHeadingId": "TIRTL_260_E",
              "siteName": "Sneydes Rd source-site location",
              "siteDescription": "Sneydes Rd source-site location",
              "locationLabel": "Sneydes Rd source-site location",
              "direction": "eastbound",
              "locality": "POINT COOK",
              "lga": "",
              "region": "West",
              "lat": -37.897545,
              "lng": 144.712445,
              "usedInMetric": false,
              "metricStatus": "Present at same source-site ID; not used in comparable valid-night metric",
              "firstDate": "2025-11-10",
              "lastDate": "2026-05-07",
              "coverageDays": 6,
              "vehiclePassings": 6.0,
              "truckPassings": 0.0,
              "truckPct": null,
              "truckPctMethod": "Not shown publicly — non-contributing heading",
              "averageSpeedKmh": null,
              "dayTruckPassings": 0.0,
              "eveningTruckPassings": 0.0,
              "nightTruckPassings": 0.0,
              "overnightPassingsPerAvailableDay": null,
              "allTruckPassingsPerAvailableDay": null,
              "averageMinutesBetweenOvernightPassings": null,
              "nightShareOfTrucksPct": null,
              "nightShareOfTrucksMethod": "Not shown publicly — non-contributing heading",
              "truckShareOfNightTrafficPct": 0.0,
              "exactSensorReference": "TIRTL source-site ID 260; base site ID TIRTL_260; directional heading E; site-heading ID TIRTL_260_E; site-heading key 260_E; neutral source-site label Sneydes Rd source-site location; direction eastbound; coordinates -37.897545, 144.712445; locality Point Cook; records observed 2025-11-10 to 2026-05-07 (6 days); not used in the comparable valid-night metric.",
              "politicalEvidenceStatement": "TIRTL_260_E is a secondary or sparse eastbound heading at the Sneydes Rd source-site location. It was not used in the comparable corridor metric. 0 truck passings among 6 classified vehicle passings; 0 overnight truck passings; 6 observed reporting days. No comparable freight conclusion should be drawn from this record. Counts are classified TIRTL sensor passings, not unique trucks, unique vehicles or complete corridor journeys.",
              "governmentQuestion": "TIRTL_260_E is not used in the comparable corridor metric. Infrastructure accountability questions should be based on the contributing heading or headings at TIRTL source site 260.",
              "coverageDescription": "Records were observed on 6 days between 10 November 2025 and 7 May 2026.",
              "popupStatisticsStatus": "Not used in comparable corridor metric",
              "popupStatisticsReason": "Percentages and frequency are withheld from the public popup because this is a secondary or sparse heading record, not a contributing comparison heading.",
              "rawSampleSummary": "0 truck passings among 6 classified vehicle passings; 0 overnight truck passings; 6 observed reporting days.",
              "auditRawTruckPct": 0.0,
              "auditRawNightShareOfTrucksPct": null,
              "auditRawOvernightPassingsPerAvailableDay": 0.0,
              "auditRawAllTruckPassingsPerAvailableDay": 0.0,
              "auditRawAverageMinutesBetweenOvernightPassings": null,
              "popupStatisticsAuditedAt": "2026-08-02T10:34:41.100036+10:00",
              "popupStatisticsAuditVersion": "4.4",
              "originalSourceSiteLabel": "Sneydes Rd (WB)",
              "publicLocationLabel": "Sneydes Rd source-site location",
              "publicLabelPolicy": "Neutral source-site location used because the source-site name carries the principal heading direction, while this secondary record has the opposite direction."
            }
          ]
        }
      ]
    }
  ]
}