CA · Highway

CA-4 W Accidents & Crashes

CA-4 W has recorded 975 traffic crashes in California since 2024, with no fatalities on record. In the last 24 hours, 4 new crashes were reported. The highest crash volumes are concentrated near Contra Costa.

Data is sourced from the California Crash Records System (CCRS), maintained by the California Highway Patrol and updated daily, and the CA 511 live incident feed, refreshed every 15 minutes. Records include crash severity, injury data, vehicle information, and precise geographic coordinates.

Breakdown by type: 15 accident, 5 construction, 1 closure.

21
Total Crashes
Filtered results
0
Fatalities
Fatal injury reports
4
Today
Reported since midnight

Crash locations on CA-4 W. Click a marker to view details.

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Crash Records

CA-4 W Incidents 21 results

15 accident 5 construction 1 closure
CHP : Traffic Hazard on CA-4 Westbound west of Discovery Bay Blvd (Discovery Bay). Lane affected. Expect delays.
Moderate Accident
Contra Costa 1 minute ago Live
CHP : Traffic Hazard on CA-4 Westbound north of Byron Hwy (Brentwood). Lane affected. Expect delays.
Moderate Accident
Contra Costa 1 minute ago Live
Caltrans : Roadwork on CA-4 Eastbound and Westbound between Byron Hwy (Brentwood) and Balfour Rd (Antioch). All lanes closed. Avoid the area. From 7:00 PM Monday, October 26, 2026 to 5:00 AM Tuesday, October 27, 2026.
Construction
Contra Costa 3 hours, 1 minute ago
CHP : Disabled vehicle on CA-4 Westbound east of CA-160 (Antioch). Center lane blocked. Expect delays.
Moderate Accident
Contra Costa 11 hours, 16 minutes ago
CHP : Traffic Collision on CA-4 Westbound at Hillcrest Ave (Antioch). Lane affected. Expect delays.
Moderate Accident
Contra Costa 1 day, 11 hours ago
CHP : Traffic Collision on CA-4 Westbound entering at Somersville Rd (Antioch). On Ramp blocked. Expect delays.
High Accident
Contra Costa 1 day, 19 hours ago
Caltrans : Emergency road closure on CA-4 Eastbound and Westbound east of San Joaquin County Line (Discovery Bay). All lanes blocked. Expect delays. From 10:45 AM Saturday, October 24, 2026 to 10:00 AM Sunday, October 25, 2026.
Road Closure
Contra Costa 1 day, 22 hours ago
CHP : Disabled vehicle on CA-4 Westbound at Bailey Rd (Pittsburg). Right shoulder open. Expect delays.
Accident
Contra Costa 2 days, 6 hours ago
CHP : Traffic Hazard on CA-4 Westbound east of I-680 N (Martinez). 3rd lane from the left blocked. Expect delays.
Moderate Accident
Contra Costa 2 days, 19 hours ago
CHP : Residual delays on CA-4 Westbound east of Somersville Rd (Antioch). Center Divider affected. Expect delays.
Low Accident
Contra Costa 2 days, 19 hours ago
CHP : Traffic Hazard on CA-4 Westbound east of Willow Pass Rd (Concord). Right lane affected. Expect delays.
Moderate Accident
Contra Costa 2 days, 23 hours ago
Caltrans : Roadwork on CA-4 Eastbound and Westbound east of Byron Hwy (Brentwood). All lanes closed. Avoid the area. From 10:00 PM Friday, October 23, 2026 to 10:00 AM Sunday, October 25, 2026.
Construction
Contra Costa 3 days, 1 hour ago
Caltrans : Roadwork on CA-4 Westbound between Laurel Rd (Antioch) and CA-160 (Antioch). Right lane and shoulder closed until 5 AM. From 7:00 PM Friday, October 23, 2026 to 5:00 AM Saturday, October 24, 2026.
Construction
Contra Costa 3 days, 7 hours ago
CHP : Traffic Hazard on CA-4 Westbound east of A St (Antioch). Center lane blocked. Expect delays.
Moderate Accident
Contra Costa 3 days, 14 hours ago
Caltrans : Roadwork on CA-4 Westbound between Laurel Rd (Antioch) and CA-160 (Antioch). Right lane and shoulder closed until 5 AM. From 7:00 PM Thursday, October 22, 2026 to 5:00 AM Friday, October 23, 2026.
Construction
Contra Costa 4 days, 4 hours ago
CHP : Traffic Hazard on CA-4 Westbound east of San Jose Ave (Antioch). Lane affected. Expect delays.
High Accident
Contra Costa 4 days, 16 hours ago
CHP : Traffic Hazard on CA-4 Westbound east of Morello Ave (Martinez). Center lane blocked. Expect delays.
Moderate Accident
Contra Costa 4 days, 17 hours ago
CHP : Residual delays on CA-4 Westbound east of Port Chicago Hwy (Concord). Right shoulder affected. Expect delays.
Moderate Accident
Contra Costa 5 days, 10 hours ago
CHP : Disabled vehicle on CA-4 Westbound east of Morello Ave (Martinez). Center lane blocked. Expect delays.
Moderate Accident
Contra Costa 5 days, 12 hours ago
Caltrans : Roadwork on CA-4 Westbound between Laurel Rd (Antioch) and CA-160 (Antioch). Right lane and shoulder closed until 5 AM. From 7:00 PM Tuesday, October 20, 2026 to 5:00 AM Wednesday, October 21, 2026.
Construction
Contra Costa 6 days, 5 hours ago
CHP : Residual delays on CA-4 Westbound entering at Sand Creek Rd (Brentwood). Left shoulder affected. Expect delays.
High Accident
Contra Costa 6 days, 23 hours ago