“This project is more than just simple road; it is an intergenerational investment in Perth and the broader South West’s future,” he said.

Transport Minister Simon O’Brien said the new highway featured a number of engineering feats.

“The 70.5 kilometres of new dual carriageway features six interchanges, 10 intersections and 19 bridges,” he said.

“More than 12 million tonnes of sand and one million tonnes of crushed rock base was used, while 27,000 cubic metres of concrete was laid. There is 32 kilometres of principal shared path for pedestrians and cyclists.

“The Murray River bridge is the biggest bridge constructed along the alignment and consists of two separate structures, each measuring 272 metres.

“The Serpentine River bridge consists of two separate structures, each measuring 112 metres.”

The project was delivered by the Southern Gateway Alliance (Leighton Contractors-WA Limestone-GHD-Main Roads WA), with the state contributing $375 million and the federal government $330 million.

News Courtesy "Construction Industry News"