Drivers will pay most of the $5.5 billion needed for a proposed toll road aimed at easing congestion on Melbourne's West Gate Bridge.

The surprise Transurban proposal will use a tunnel and an elevated freeway along Footscray Rd to join the West Gate Freeway with CityLink. The bid relies on almost $2 billion coming from the federal government, with the rest coming from new tolls and the extension of existing tolls. Premier Daniel…