Description
Spanning almost the entire width of Contra Costa County, California State Route 4 is an east–west highway which begins in Hercules and ends in Antioch. The road is an expressway from Hercules until it approaches Martinez, at which point it becomes a full freeway – the California Delta Highway. Tracks for Bay Area Rapid Transit run in the median of the freeway from Concord to Antioch.
Incentives for Contra Costa Commuters
Tired of sitting in traffic? 511 Contra Costa offers a variety of incentives to try a different commute. Use our Incentives Finder to discover the rewards and offers available for different commute types.
And you don’t have to worry about getting stranded at work with our free Guaranteed Ride Home program. Any day you skip the solo drive to work, you can get a free ride home in case an emergency or unexpected events change your travel plans.
Current Status
For current highway information along State Route 4, visit the Caltrans Road Information page and enter “4” where it asks for the highway number. For visual traffic congestion information, you can also click “VIew larger map” on the Google map below, click “Layers”, and then select “Traffic”.
