Tonkin Highway Extension and Thomas Road Upgrade

Perth’s south-east corridor, home to fast-growing communities like Byford, Armadale, Kelmscott and Gosnells, is currently impacted by high volumes of heavy vehicles and through-traffic travelling to and from the South West and Wheatbelt regions.

The Tonkin Highway Extension and Thomas Road Upgrade will provide safer, more efficient travel for road users and heavy vehicles, reduce congestion, and improve connectivity between current and future residential, commercial, and employment areas.

These projects are being delivered together due to the timing of development and delivery, overlap of stakeholders and geographical location.

Tonkin Highway Extension

This project involves a new 14 km four-lane dual carriageway between Thomas Road and South Western Highway. It includes:

• Principal Shared Path (PSP) along the eastern side of the highway for the full 14 km, with connections to Thomas Road, Orton Road, Bishop Road, Mundijong Road and South Western Highway

• Five underpasses and a footbridge at Orton Road for safe crossing by pedestrians, cyclists

• Grade-separated interchange at Bishop Road to improve traffic flow and safety

• Roundabouts at Orton Road, Mundijong Road and South Western Highway

• Underpasses at Abernethy Road and Shanley Road to support vehicle, pedestrian, cyclist, and horse movements

• Underpass at Gossage Road to support pedestrian, cyclist and horse movements

• Rail bridges at Bishop Road and Wright Road

• Noise and visual screening walls, lighting throughout, and improved local road access including emergency egress

The project also caters for recreational needs by supporting the region’s equestrian network with several dedicated horse underpasses and connections.

Thomas Road Upgrade

This upgrade covers the duplication of 4.5 km of Thomas Road between Kargotich Road and South Western Highway, and includes:

• A new grade-separated interchange with Tonkin Highway to improve traffic flow

• A new 4.5 km shared path on the southern side

• A signalised equine crossing connecting Byford and Darling Downs bridle paths

• Intersection upgrades, including:

  • New roundabouts at Kardan Boulevard and Masters Road/Malarkey Road

  • Left-in/left-out access at Ballak Place and Briggs Road

  • Cul-de-sacs at Hopkinson Road (north and south of Thomas Road)

  • New traffic signals at Plaistowe Boulevard

  • Reconstructed intersection at Wungong South Road

• Realignment of the equine path network north of Thomas Road to maintain connectivity

tonkin-highway-extension-project-map.pdf

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