Department of Infrastructure, Transport, Cities and Regional Development print logo Building our Future print logo

Tonkin Highway Stage 3 Extension

Funding Program:Investment Road and Rail Program
Status:In planning
Transport Mode:Road
Expected Start/Finish:Early 2023 - Mid 2025
Estimated Project Cost:$505,000,000
Australian Government Contribution:$404,000,000
Local Council/Shire:Shire of Serpentine Jarrahdale

Project Description

The Tonkin Highway is a 45km north-south highway connecting Reid Highway to Thomas Road, Oakford. It connects the south-east corridor with the north-west and north-east corridors of the Perth metropolitan area.

The south-east corridor is an important and fast growing area faced with increased congestion, higher travel times for freight vehicles and reduced safety outcomes on the existing road network. Population projections show that by 2031, sustained growth in the south-east sub-region will increase by 35 per cent from the 2008 base level. This additional population will put significant pressure on the existing road network with volumes exceeding recommended capacity.

The project will extend the Tonkin Highway from Thomas Road to the South Western Highway including at grade separations at Thomas, Orton, and Mundijong Roads and South Western Highway and a grade separated interchange at Bishop Road.


The project will:

  • improve freight efficiency, connectivity and travel time
  • improve road safety and reduce congestion for all road users


The Australian Government has committed $404 million towards the $505 million project.


The project is in planning.

Disclaimer: The material contained in this site is made available on the understanding that the Department is not thereby engaged in rendering professional advice for a particular purpose. Before relying on the material in any important matter, users should carefully evaluate the accuracy, completeness and relevance of the information for their purposes and should obtain appropriate professional advice relevant to their particular circumstances.

Project details last updated: 6/10/2021