A3 and A6 corridor capacity

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A3 and A6 corridor capacity

Southern Sydney to Ryde road network capacity
Potential investment options (Stage 2)
Sydney, NSW
Fast-growing cities
Efficient urban transport networks
Problem/Opportunity timeframe
Near term (0-5 years)
Proposed By
NSW Government
Date added to the IPL
14 February 2019


The A3 and A6 corridors are major arterial roads that service north–south journeys for both freight and general traffic in Sydney. High traffic volumes on both corridors are leading to slow and unreliable trips, and are impacting on freight productivity, particularly during peak times. The 2015 Australian Infrastructure Audit identified the A3 between the M4 Motorway and Princes Highway, and the A6 between Sutherland and Ryde, as Sydney’s second and fifth worst routes for congestion, as measured by delays per lane kilometre.

The A3 and A6 both connect to the M5 and M4 motorways. The A3 provides freight access between Sydney and the Sutherland Shire/Illawarra region, as well as to Sydney Airport, Port Botany and the Chullora and Enfield intermodal terminals. Up to 98,500 vehicles use the A3 each day at its busiest section – Concord Road at Rhodes.

The A6 serves as a key road transport link to the Bankstown Strategic Centre, and carries approximately 65,000 vehicles a day along Stacey Street near Bankstown.

Potential options

Capacity constraints on the A3 and A6 corridors could be addressed through a range of interventions, such as intersection upgrades and road widening. Potential upgrades should be considered in the context of an overall integrated program, as improvements to either of the corridors may also reduce pressure on the other.

Next steps

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