Skip to main content

Mandurah Line now open for passengers after 20-day shutdown to facilitate major works on the Thornlie-Cockburn Link.


Leach Highway and Welshpool Road Interchange upgrades



  • Road

    Project type
  • $136 million

    Total budget
  • Under Construction

    Project phase
  • Main Roads WA

    Lead agency
  • 600

    Jobs supported
  • Mid 2021

    Start date

    Early 2023

    End date

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 along Leach Highway from Sevenoaks Street to Orrong Road, including over the Armadale rail line.

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

Detour options

  • Ewing Street North Traffic Changes

    Vehicles will be unable to enter Ewing Street North from Railway Parade for 6 months from Monday 2 August 2021.  

    Traffic at the southern end of Ewing Street North, near Railway Parade, will be reduced to one outgoing lane only, to enable:

    • Roadworks to change the alignment of Ewing Street North near Railway Parade
    • Construction of walls for the new bridge over the railway line.

    Vehicles will be able to enter and exit Ewing Street North from Welshpool Road and exit onto Railway Parade as usual.

    We recognise these changes and construction activities can be disruptive, and we thank you for your patience while these works are underway.

Plan your journey

Avoid disruptions to your journey and plan your trip