Finishing South Australia’s largest infrastructure project will cost upwards of $9 billion and take another 10 years with the state government’s latest budget revealing the final plans for Adelaide’s north-south road corridor.

The development will provide for 78 kilometres of non-stop motorway that will cut freight costs and reduce travel times.

It will allow motorists to bypass 21 traffic lights and remove an estimated 110,000 vehicles form surrounding roads.

In its 2020/21 budget on Tuesday, the government allocated $1.96 billion over the next four years to start the work on the final and most difficult portion of the South Road project.

It said it had also settled on a plan to include two tunnels in the 11km section, one 4.3km long and a second 2km long.

That will cut the number of properties to be bulldozed to about 390, down from about 900 with a conventional roadway.

Premier Steven Marshall said the project’s economic benefits were “unarguable”.

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“The project is a generational game changer for South Australian motorists and the largest delivered in over a century,” Mr Marshall said today.

“The benefits will be felt for generations with the project alone estimated to create 4000 jobs.”

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