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  • Armadale Line Transformation major works start 20 November 2023. Find out more.


Leach Highway and Welshpool Road Interchange upgrades



  • Road

    Project type
  • $136 million

    Total budget
  • Complete

    Project phase
  • Main Roads WA

    Lead agency
  • 600

    Jobs supported

This project involves upgrading the intersection of Leach Highway and Welshpool Road, currently one of Perth’s most congested intersections.

Constructions works include a grade-separated interchange at the intersection with a new road bridge installed at Leach Highway over the Armadale/Thornlie rail line.

There will also be a shared path for cyclists and pedestrians. 

The project will also support the east-west freight link connecting Fremantle with the Kewdale and Welshpool industrial area.


  • Improved traffic flow and efficiency
  • Significantly reduced travel times and improved road safety
  • Create local jobs and contract opportunities

Project map

This map shows an aerial view of the project location.
Project work area

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