Sydney’s skyline (Wirestock/Dreamstime)

An investment of US$620m (A$1bn) has been announced for building a transit corridor from the suburb of Liverpool to the new Western Sydney International Airport.

Jointly funded by local and state governments, the project will upgrade congested Fifteenth Avenue, which is used by 22,000 vehicles per day.

The new Fifteenth Avenue will connect multiple modes of transport to the new Bradfield city centre, the new metro system and the new airport.

Western Sydney is the fastest growing region of New South Wales (NSW), with the government predicting that the population could rise by as much as 63,000 by 2041.

Anthony Albanese, Australia’s prime minister, said: “My Government wants Western Sydney to be a gateway to the rest of the world. We want it to thrive as the engine room for jobs, economic growth and opportunity.”

John Graham, NSW’s minister for roads, said: “The jobs and investment being brought by Western Sydney Airport will be squandered if Fifteenth Avenue remains a two-lane road from a time gone by.

“With this substantial investment in the road infrastructure of Western Sydney we are building a highway to economic opportunity.”

The Australian government has said US$11.1bn (A$18bn) is being spent on transport infrastructure in West Sydney, including on projects such as the Sydney Metro and the M12 Motorway.