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Stage 23A.4 graph gallery

Complete governed visual evidence for truck operating-speed pressure and night-to-night reliability. The frozen reference is VTA_STAGE23A4_P85_20251101_20260521. These graphs describe detector point-speed estimates and do not calculate journey delay or truck-hours lost.

48graph designs
16executive graphs
32heading profiles
269Tier A headings in the baseline

48 graphs shown

Colour key

Stage 23A.4 graph colour semantics

Colour is never the sole encoding: charts also use labels, ranks, marker shapes and line styles.

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Executive ranking

Community-road operating-speed pressure

All 12 governed Tier A community headings, ranked against their own heading-and-hour P85 references.

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Executive ranking

Top 20 strategic-network operating-speed pressure headings

Colour indicates governed pressure severity; labels show threshold occurrence and sustained nights.

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Observed versus reference

Community-road observed speed versus P85 reference

The connecting gap shows each heading’s long-period operating-speed deficit.

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Observed versus reference

Top 20 network headings: observed speed versus P85 reference

Observed and reference speeds are detector point-speed estimates, not corridor travel speeds.

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Relationship

Operating-speed pressure versus night-to-night reliability

High-right points combine frequent speed pressure with large variation between better and worse nights.

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Hourly heatmap

Community-road hourly pressure heatmap

Rows follow the community pressure ranking; cells show the hourly pressure index.

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Hourly heatmap

Top 30 network headings: hourly pressure heatmap

The colour progression runs from lower pressure through amber and orange to severe red.

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Reliability interval

Community-road night-to-night reliability ranges

Thin line is P10–P90, thick line is P25–P75, and the diamond is the median nightly ratio.

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Reliability interval

Top 20 network reliability-risk headings

Longer intervals indicate greater variation between better and worse eligible nights.

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Exclusive pressure bands

Community-road exclusive pressure bands

Bands are mutually exclusive and sum to 100%; nested threshold measures are not double-counted.

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Exclusive pressure bands

Top 20 network headings: exclusive pressure bands

Green is 90% or more of reference; amber, orange and red indicate progressively greater pressure.

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Governance

Governed speed-evidence tiers

The 283 robust headings partition into full temporal, aggregate-only and sparse evidence.

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Tier B

Tier B long-period descriptive speed ranges

P10–P90 ranges with median and volume-weighted mean. These headings remain excluded from temporal rankings.

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Sustained pressure

Strategic-network headings with the most sustained pressure nights

Colour follows the overall governed pressure severity category.

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Worst nights

Lowest worst-night operating ratios on the strategic network

Lower values indicate a more severe departure from the heading’s frozen overnight reference.

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Community heading profile

Community pressure rank 1: Sydney Rd and Jukes Rd (SB)

Sydney Road · FAWKNER · southbound | overall pressure index 34.1

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Community heading profile

Community pressure rank 2: Grieve Pde (SB)

Grieve Parade · ALTONA NORTH · southbound | overall pressure index 17.3

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Community heading profile

Community pressure rank 3: Grieve Pde (NB)

Grieve Parade · ALTONA NORTH · northbound | overall pressure index 16.0

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Community heading profile

Community pressure rank 4: Princes Hwy and Federation Trail (EB)

Princes Highway · BROOKLYN · eastbound | overall pressure index 11.7

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Community heading profile

Community pressure rank 5: Fitzgerald Rd and Federation trail (NB)

Fitzgerald Road · LAVERTON NORTH · northbound | overall pressure index 10.6

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Community heading profile

Community pressure rank 6: Mountain Hwy NR Violen St (EB)

Mountain Highway · BAYSWATER · eastbound | overall pressure index 10.1

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Community heading profile

Community pressure rank 7: Dohertys Rd (EB)

Dohertys Road · ALTONA NORTH · eastbound | overall pressure index 7.8

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Community heading profile

Community pressure rank 8: Fitzgerald Rd and Federation trail (SB)

Fitzgerald Road · LAVERTON NORTH · southbound | overall pressure index 6.5

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Community heading profile

Community pressure rank 9: Princes Hwy and Federation Trail (WB)

Princes Highway · BROOKLYN · westbound | overall pressure index 6.2

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Community heading profile

Community pressure rank 10: Mountain Hwy NR Violen St (WB)

Mountain Highway · BAYSWATER · westbound | overall pressure index 5.9

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Community heading profile

Community pressure rank 11: Dohertys Rd (WB)

Dohertys Road · ALTONA NORTH · westbound | overall pressure index 5.5

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Community heading profile

Community pressure rank 12: Nepean Hwy NR Arnot St (NB)

Nepean Highway · BRIGHTON EAST · northbound | overall pressure index 4.6

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Network heading profile

Network pressure rank 1: Tullamarine FWY Inbound - Before Mickleham Rd (SB)

M2 Tullamarine Freeway · WESTMEADOWS · southbound | overall pressure index 56.0

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Network heading profile

Network pressure rank 2: Tullamarine FWY Outbound - After Mickleham Rd Exit (NB)

M2 Tullamarine Freeway · TULLAMARINE · northbound | overall pressure index 41.6

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Network heading profile

Network pressure rank 3: WGB_OUTBOUND_W

West Gate Bridge · CORRIDOR_ONLY · outbound_westbound | overall pressure index 37.9

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Network heading profile

Network pressure rank 4: Tullamarine FWY Outbound - Before Airport Long-Term (NB)

M2 Tullamarine Freeway · TULLAMARINE · northbound | overall pressure index 34.9

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Network heading profile

Network pressure rank 5: WGB_INBOUND_E

West Gate Bridge · CORRIDOR_ONLY · inbound_eastbound | overall pressure index 30.0

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Network heading profile

Network pressure rank 6: Tullamarine FWY Inbound - A1 Airport Parking (SB)

M2 Tullamarine Freeway · MELBOURNE AIRPORT · southbound | overall pressure index 29.5

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Network heading profile

Network pressure rank 7: Tullamarine FWY Outbound - Before Mickleham Rd Exit (NB)

M2 Tullamarine Freeway · TULLAMARINE · northbound | overall pressure index 28.3

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Network heading profile

Network pressure rank 8: M1 Outbound - Before Clyde Rd Exit Ramp (CH 44360)

M1 Monash-Princes Freeway East · BERWICK · eastbound | overall pressure index 22.4

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Network heading profile

Network pressure rank 9: M1 Outbound - Far Side of Pakenham Rail Bridge

M1 Monash-Princes Freeway East · BERWICK · eastbound | overall pressure index 21.5

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Network heading profile

Network pressure rank 10: WGT - Inbound Main Carriageway

West Gate Tunnel Corridor · LAVERTON NORTH · eastbound | overall pressure index 20.0

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Network heading profile

Network pressure rank 11: M1 Inbound - Before Clyde Rd exit (CH 45900)

M1 Monash-Princes Freeway East · BERWICK · westbound | overall pressure index 17.4

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Network heading profile

Network pressure rank 12: M1 Outbound - Pakenham Rail Bridge (THIN transmitter)

M1 Monash-Princes Freeway East · NARRE WARREN · eastbound | overall pressure index 16.4

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Network heading profile

Network pressure rank 13: M1 Inbound - Past Soldiers Rd Overpass (Ch 46450)

M1 Monash-Princes Freeway East · BERWICK · westbound | overall pressure index 16.1

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Network heading profile

Network pressure rank 14: M1 Inbound - Soldiers Rd Overpass (CH 46870)

M1 Monash-Princes Freeway East · BERWICK · westbound | overall pressure index 15.5

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Network heading profile

Network pressure rank 15: M1 Outbound - Princes HWY On Ramp Bullnose

M1 Monash-Princes Freeway East · BERWICK · eastbound | overall pressure index 14.6

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Network heading profile

Network pressure rank 16: PFW 510m West of High Street/Newland St (IB)

M1 Princes Freeway West · LAVERTON · eastbound | overall pressure index 14.2

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Network heading profile

Network pressure rank 17: WGT - Inbound Main Carriageway

West Gate Tunnel Corridor · LAVERTON NORTH · eastbound | overall pressure index 13.5

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Network heading profile

Network pressure rank 18: WGT - Inbound Main Carriageway

West Gate Tunnel Corridor · BROOKLYN · eastbound | overall pressure index 13.4

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Network heading profile

Network pressure rank 19: M1 Inbound - Before Soldiers Rd

M1 Monash-Princes Freeway East · BERWICK · westbound | overall pressure index 13.4

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Network heading profile

Network pressure rank 20: WGT - Inbound Main Carriageway

West Gate Tunnel Corridor · BROOKLYN · eastbound | overall pressure index 12.9

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