The Government of Western Australia (WA) has announced that construction is underway on two new bridges over the Mitchell Freeway in the state. 

These bridges are a part of the new Stephenson Avenue Interchange and the Stirling Station Bus Interchange projects. 

The project team has adopted a construction method whereby the bridges will be built and launched from one side of the highway to the other. 

This method involves the use of casting beds, where reinforced concrete bridge sections are poured, cured, and then launched into position over live traffic conditions. 

This is expected to ensure continuous access for vehicles and trains during the process.  

Permanent and temporary piers have been erected along the freeway while traffic will be redirected onto a temporary alignment to facilitate the completion of the works.  

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To ensure that bus services remain operational throughout the construction period, a temporary bus entrance has been constructed. 

Construction of the two bridges is expected to be completed within six months.  

The Stephenson Avenue Extension project is already more than 40% complete.  

The first phase, which extended Stephenson Avenue to Howe Street, included the addition of two new signalised intersections. 

The second phase will extend Stephenson Avenue from Howe Street to the Mitchell Freeway. 

It will also feature a grade-separated interchange, a new bridge over the freeway and train line, and additional road connections.  

The Stephenson Avenue Extension and Stirling Bus Interchange projects receive joint funding from the state and commonwealth governments of Australia. 

WA Transport Minister Rita Saffioti said: “Over the next six months, people will see these bridges gradually emerging over the Mitchell Freeway, but the construction method we’re using means that access for road users and train commuters will be maintained. 

“This Stephenson Avenue Extension project is transformational for this part of our city and will make a big difference to the way people commute and get around.”