The four-lane motorway is planned to be 14 km long and to be built at a cost of $1.75 billion (with both State and Federal funding).

It is aimed at providing direct access from the M7 Westlink Motorway to the new Western Sydney Airport situated at Badgerys Creek.

On 17 June 2014, as part of the State Budget, the NSW Government announced a $5.5 billion road package for Western Sydney.

[4] However, in recent years, government media and press releases simply refer to it as M12 Motorway.

[5] Major construction commenced in 2022 and is expected to be completed prior to the Western Sydney Airport opening in December 2026.