Tonkin Highway Extension

Thomas Road to South Western Highway

In planningFuture

Extend Tonkin Highway an additional 14 kilometres.

Tonkin Highway intersection

What's happening

 Expression of Interest called for delivery contractors

Procurement has commenced for the southern extension of Tonkin Highway to South Western Highway and upgrade of Thomas Road, with an Expression of Interest released for delivery contractors.

 Read more in the latest media statement

 Visualisation Video

A fly-through visualisation video has been produced to show an artistic view of what the Tonkin Highway Extension and Thomas Road Upgrade will look like once complete.

 Road safety star rating

An Australian Road Assessment Program (AusRAP) assessment was recently undertaken for the project, with Star Ratings awarded based on its level of safety. The assessment was led by Main Roads in collaboration with Arup and iRAP/AusRAP.

The project achieved a fantastic result:

  • 5 stars for active transport (pedestrians and cyclists)
  • 4 stars for vehicles
  • 3 stars for motorcyclists (due to highway’s higher speed limit)

AusRAP provides independent information and advice about the safety of our major highways and identifies measures to improve safety, and reduce road trauma (road fatalities and serious injury).

 Heritage Interpretation Study

The project is conducting a Heritage Interpretation Study, to identify and explore key Traditional Landowner and European history opportunities that can be incorporated within the Urban Landscape and Design Framework. A significant component of this is Traditional Landowner liaison. As part of this liaison, the project team (and heritage consultant Element) have conducted a storytelling workshop with Aboriginal Elders, looking at the Aboriginal and historic heritage site locations, opportunities for interpretation and developing a vision for the project.

 Sustainability excellence

The project’s planning recently achieved a ‘Bronze’ Rating under the Infrastructure Sustainability Council Infrastructure Sustainability (IS) Rating Scheme, with a score of 27.2 points across 16 credits. The credits included Urban and Landscape Design, Resilience, Climate Change, Resource Efficiency, and Stakeholder Engagement.

The Bronze rating recognises the joint efforts of the Main Roads and Arup project teams’ to plan for best practice outcomes in sustainability. Main Roads and Arup jointly submitted the Tonkin Highway Extension project for nomination for the Infrastructure Sustainability Council’s (ISC) Annual Award and were shortlisted as finalists for the Award.

The Bronze rating will set the Delivery team up to achieve the mandated Silver ISC rating for the design and construction phase of the project.



pressure on surrounding roads


travel times


road connectivity

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Acknowledgement of country

The Government of Western Australia acknowledges the traditional custodians throughout Western Australia and their continuing connection to the land, waters and community. We pay our respects to all members of the Aboriginal communities and their cultures; and to Elders both past and present.

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