VICTORIAN FREIGHT NETWORK INTELLIGENCE — DATA COVERAGE SUMMARY
Generated: 2026-08-06T21:04:34.840629+10:00

TIRTL OFFICIAL SOURCE
Source: TIRTL Traffic Counts and Classification
Publisher: Department of Transport and Planning, Victoria
URL: https://opendata.transport.vic.gov.au/dataset/tirtl-traffic-counts
Licence: Creative Commons Attribution 4.0
Update frequency: Daily
Reporting period: 1 November 2025 to 4 August 2026
Duration: 277 inclusive days (39 weeks and 4 days)
Calendar months represented: 10
Last updated: 5 August 2026
Resolution: 15-minute aggregate bins by date, time, site, heading, Austroads vehicle class and speed bin

CURRENT GOVERNED TIRTL ANALYTICAL WINDOW
Period: 1 November 2025 to 21 May 2026
Duration: 202 inclusive days (28 weeks and 6 days)
Calendar months represented: 7
Overnight window: 10:00 pm to 6:00 am
Scale: 3.13B+ classified records; 159.6M+ truck passings
West Gate Tunnel opening: 14 December 2025
Pre-opening nights: 43
Nights on or after opening: 159
Classification: Mixed pre-opening, opening-transition and early-operation reference

SCATS
Coverage: 2014 to 7 April 2026
History: 12+ years
Geographic context: 517 Victorian suburbs
Resolution: 15-minute signal-derived traffic movement observations
Semantic boundary: SCATS movements are signal-derived movement observations, not simple unique-vehicle counts.

COVERAGE BOUNDARY
The overall date range does not mean every detector or heading operated continuously. Devices can experience outages, commissioning or decommissioning, and individual locations can have different temporal ranges. Missing intervals are not interpreted as zero traffic. Sensor passings are not unique vehicles or complete journeys.