Major Contract

Tonkin Highway Extension - Stage Three

Under Procurement
Tonkin Highway Extension - Stage Three

The WA Government is undertaking improvements to the Tonkin Highway corridor. The Tonkin Highway is a 44 kilometre north-south highway and partial freeway in Perth, Western Australia, linking Perth Airport with the city's north-eastern and south-eastern suburbs. 

The Stage Three Extension project will extend the Tonkin Highway from Thomas Road, Oakford to the South Western Highway, south east of Mundjiong. 

The project will include:

  • 16.5 kilometres of four lane dual carriageway
  • an upgraded intersection at Thomas Road/Tonkin Highway
  • new intersections at Orton Road, Mundijong Road and South Western Highway
  • a new grade separated interchange at Bishop Road
  • bridges over the existing freight rail line and Perth to Bunbury passenger rail line and Wright Road
  • a shared use path along the eastern side of the Tonkin Highway corridor, connecting to local path networks
  • an equestrian and pedestrian / cyclist underpass under Tonkin Highway at Abernethy Road, and
  • associated service roads and modifications to local government roads and intersections.

Key Dates

Mar 2021 EOIs Open
Apr 2021 EOIs Close
2021 Expected Contract Award
2022 Expected Construction Commencement
2024 Expected Construction Completion

Funding contributions

Federal Government
WA Government


Procuring Agency: Main Roads Western Australia


May 2019 The project was allocated funding as part of a $1.2 billion funding package announced in the 2019-20 WA Budget.
Jan 2021 Main Roads Western Australia hosted an industry workshop to seek feedback from contractors for the delivery of the Tonkin Highway Expansion project. Feedback from the workshop will inform the delivery and contract type.
Mar 2021 Main Roads Western Australia opened Expressions of Interest (EOIs) for the project, closing on 20 April. The department also announced that the project will be delivered as an Alliance contract.
Mar 2022 The 2022-23 Federal Budget allocated an additional $200 million to Stage Three of Tonkin Highway Extension.
May 2022 The 2022-23 WA Budget allocated an additional $250 million toward the Tonkin Highway Grade Separations at Hale, Welshpool and Kelvin Roads and Stage Three Extension projects.
Procurement approach
Alliance |
Western Australia | National |
Infrastructure Australia status
Priority Initiative (long-term, 10-20 years)
Media releases