The WestConnex interchange site at St Peters would be sold for housing, train fares to Sydney Airport slashed, and work on a new rail line between central Sydney and Parramatta accelerated under the City of Sydney council's alternative to the $16.8 billion motorway.

The council's proposal also involves a significant upgrade to King Georges Road to substitute for the WestConnex tunnel under the inner west, and potentially smaller road tunnels linking Sydney's existing motorway network direct to Sydney Airport and the Cross City Tunnel.

Clover Moore is pushing the proposal to highlight what she sees as significant flaws with WestConnex. Credit:James Brickwood

With the Gladys Berejiklian government seemingly wedded to its plans for WestConnex, the council's alternative proposal is unlikely to amount to more than an academic exercise.

But lord mayor Clover Moore is nevertheless pushing the proposal in part to highlight what the council sees as significant flaws in the government's fast-growing motorway vision for Sydney.