It is a new $100 million road linking Melbourne Airport to the Western Ring Road, and it will take up to 15,000 cars a day off Tullamarine Freeway.

Next to it is a patch of dirt, earmarked for the long-awaited - and currently cancelled - airport rail link.

Roads Minister Luke Donnellan, opening the new road on Sunday, said the 3.3-kilometre stretch would reduce congestion on the Tullamarine Freeway, making it far easier for commuters from the west to access Melbourne Airport.

The new four-lane road includes the renaming of a part of Melrose Drive to Airport Drive.