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Highway 4 is one of the most congested roadways in the nation, according to Inrix data. The Highway 4 projects will add significant capacity to the corridor by adding two additional travel lanes in each direction, including a High Occupancy Vehicle (HOV) lane for carpools and buses. In addition, the median of the reconstructed highway will be wide enough to accommodate the upcoming extended BART services from the current terminus at Pittsburg/Bay Point to a new station at Hillcrest Avenue in Antioch. See the Background and Funding pages for more information.

Click on the project map for more information about the Highway 4 projects.Highway 4 Projects Map