Prospect Highway capacity

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Western Sydney road network capacity
Priority Initiative
Infrastructure Category
Proposed By
NSW Government
Near term (0-5 years)
Western Sydney, NSW
53_Prospect Highway capacity


The section of the Prospect Highway/ Blacktown Road between Wall Park Avenue and the M4 Western Motorway is currently at capacity, carrying approximately 36,000 vehicles per day with only a single lane in each direction. Approximately 10% of the traffic (or 3,600 vehicles) are heavy vehicles. Traffic volumes are forecast to reach approximately 75,000 vehicles per day within the next 25 years, which would double the existing peak hour volumes.

The two-lane, two-way configuration of the bridge over the Great Western Highway limits capacity and creates a bottleneck.

Existing travel speeds average around 30 km/h during peak periods, which is half the speed limit. Traffic modelling suggests travel speeds will further deteriorate to 25 km/h for light vehicles, 19 km/h for heavy vehicles and 7 km/h for public buses by 2038.

Proposed initiative

The initiative involves an upgrade of a 3.6 km section of the highway to a generally four-lane divided carriageway of consistent standard, with a range of improvements to interchanges, intersections and public and active transport infrastructure.

Next steps

Proponent to complete business case development (Stage 3 of Infrastructure Australia’s Assessment Framework).