A dangerous "pinch point" on the Western Ring Road will be widened and made safer after the Abbott government matched a $150 million commitment from the Victorian government to upgrade the road.

The two-lane stretch of the ring road between Sunshine Avenue and the Calder Freeway will be widened to three lanes at a cost of $300 million, and overhead electronic signage, variable speed limit signs and CCTV cameras installed.

The EJ Whitten Bridge across the Maribyrnong River will also be widened and will get new safety barriers as part of the project.