Melbourne City Council is set to formally oppose the Western Distributor toll road plan, which will direct traffic into the city via two new freeway off-ramps in Docklands and North Melbourne.

Greens councillor Cathy Oke will next week put a motion before the council condemning the road, saying it would "significantly increase congestion on inner city streets".

An artist's impression of the government's preferred route for Transurban's Western Distributor project.

It is not yet clear if a majority of Cr Oke's colleagues will support condemning the road plan, a joint project between Transurban and the Andrews government.

Cr Oke's motion said the council needed to oppose the $5.5 billion road plan because it contradicted many Melbourne City Council policies.