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Road to link Melbourne's west to airport

A new six-lane road has been proposed to ease congestion and provide alternative access to the airport from Melbourne's west.

Melbourne Airport spokeswoman Anna Gillett said the proposed $80 million extension of Airport Drive would allow commuters to get to the airport directly from the Western Ring Road rather than the Tullamarine freeway.

"What we simply are wanting to do is expand and extend that to provide a link from the west," Ms Gillett told AAP on Tuesday.

"As we all know, there is some congestion there".

The preliminary draft plan released on Monday will be available for public comment until March next year.

The federal government also needs to sign off on the project, which could get started by mid next year, but which will take at least 21 months to construct.

"Because we are on federal land they need to sign it off," Ms Gillett said.

The draft plan estimated the number of people travelling to Melbourne Airport would grow from 109,000 a day in 2012 to 170,000 in 2026.

The Victorian Department of Transport is undertaking a one-year feasibility study of a rail link to Melbourne Airport.