Major Contract

Tonkin Highway Gap

Under Delivery
Tonkin Highway Gap

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 Tonkin Highway Gap project will involve upgrading the section of the Tonkin Highway between Collier Road and the Great Eastern Highway. It is expected that this will resolve a 'gap' in service levels and infrastructure between Gateway WA and Northlink WA.

The upgrades include:

  • additional traffic lanes in each direction between Collier Road and Dunreath Drive
  • new bridges over the Swan River, Guildford Road, Railway Parade, the Midland Line railway and Dunstone Road
  • upgrades to the Guildford Road and Great Eastern Highway interchanges
  • a new shared pedestrian and cycle path with bridges, underpasses and local connections, and
  • noise walls, lighting and amenity improvements. 

Key Dates

Aug 2019 EOIs Open
Sep 2019 EOIs Close
Jun 2020 Contract Award
Jan 2021 Construction Commencement
Jul 2024 Expected Construction Completion

Funding contributions

Federal Government
WA Government
WA Government


Procuring Agency: Main Roads Western Australia
Successful Tenderer: The Tonkin Gap Alliance comprising BMD, Georgiou, WA Limestone, BG&E and GHD


May 2019 The project was allocated funding as part of a $1.2 billion funding package announced in the 2019-20 WA Budget.
May 2020 The project's preferred proponent, the Tonkin Gap Alliance was announced.
Nov 2020 The project's early works commenced.
May 2023 The 2023-24 WA Budget allocated an additional $161 million to the project.
Dec 2023 Mainroads WA indicated construction on the project would not be completed in 2023 as planned, with works expected to continue to mid-2024.
Estimated Total Cost
Procurement approach
Alliance |
Western Australia | National |