The NSW government will rip up a popular cycleway to make way for a new motorway under major road changes planned for Sydney Airport.

The Alexandra Canal Cycleway, which runs along the airport’s northern boundary, will be cut at both ends by the proposed Sydney Gateway, a new motorway designed to carry traffic from the WestConnex toll road to Sydney Airport.

Alternative cycling routes are being investigated by Roads and Maritime Services, though many cyclists are upset about losing a popular waterside link that is flat and direct.

Airport Drive will be closed and motorists travelling between the international and domestic terminals will be diverted onto the Sydney Gateway motorway when it opens, expected to be in 2023.