​​​Tonkin Highway Corridor

Roe Highway to Kelvin Road

  • Widening a 6 kilometre section
  • Planning and development now underway


Image with overlaid text: Tonkin Highway upgrade, New interchanges at Kelvin and Welshpool roads, Widening a 6 km stretch from just south of Roe Highway to Kelvin Road removing three sets of traffic signals and improve travel times and safety.


We are planning to upgrade a critical section of the State’s transport network by widening Tonkin Highway from just south of Roe Highway to Kelvin Road from four to six lanes and to a freeway standard.​​

​The project includes removing three sets of signalised intersections. The preliminary concept for the project includes:

  • Upgrade Tonkin Highway from four to six lanes from Roe Highway to Kelvin Road
  • Construction of new grade-separated interchanges at the Tonkin Highway intersections with Welshpool Road and Kelvin Road

We've been working on concept designs for the Tonkin Highway corridor – south of Roe Highway and the initial concept proposed a flyover at Hale Road (no direct connection to Tonkin Highway). However, we are now re-examining options for providing connections to and from Tonkin Highway at Hale Road.

An extensive traffic modelling process for the project is unde​rway, and this will include assessing the impacts of options at Hale Road including the proposed flyover. As a first step, more than 50 loggers and 25 cameras have been in place on Tonkin Highway and surrounding roads to monitor traffic volumes and vehicle journeys.

We will have the results of the traffic modelling early-2020. Shortly thereafter we will share the results with the local community and seek feedback on potential issues to ensure the best project outcomes.

Project Update

A number of activities are now underway to confirm the scope and include:

  • initial stakeholder consultation to identify and resolve various issues/constraints 
  • concept design, geotechnical and site investigations, traffic modelling and environmental assessments to inform environmental processes and approvals


  • 2019 and 2020: Planning and Development
  • Construction timeline is subject to environmental and statutory approvals and finalisation of project scope


  • Significantly improve travel times and safety outcomes.
  • Provide improved freight access to the Maddington-Kenwick and Welshpool strategic industrial areas.


The Federal ($293 million) and State ($73) Governments have committed funding.

Last Updated: 11 February 2020