CA · Highway

CA-4 W Accidents & Crashes

CA-4 W has recorded 973 traffic crashes in California since 2024, with no fatalities on record. In the last 24 hours, 2 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. Last updated Oct. 27, 2026.

Breakdown by type: 76 accident.

76

Total Crashes

Filtered results

0

Fatalities

Fatal injury reports

0

Today

Reported since midnight

Today's Accidents Today's Fatalities

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

Crash Records

CA-4 W Incidents 76 results

76 accident

CHP : Traffic Collision on CA-4 Westbound entering at Somersville Rd (Antioch). On Ramp blocked. Expect delays.

Contra Costa 1 day, 17 hours ago

CHP : Traffic Hazard on CA-4 Westbound east of San Jose Ave (Antioch). Lane affected. Expect delays.

Contra Costa 4 days, 15 hours ago

CHP : Residual delays on CA-4 Westbound entering at Sand Creek Rd (Brentwood). Left shoulder affected. Expect delays.

Contra Costa 6 days, 21 hours ago

CHP : Traffic Collision on CA-4 Westbound east of Alhambra Ave (Martinez). Left and center lanes blocked. Expect delays.

Contra Costa 1 week ago

CHP : Traffic Collision on CA-4 Westbound west of Loveridge Rd (Pittsburg). Off Ramp blocked. Expect delays.

Contra Costa 2 weeks, 3 days ago

CHP : Traffic Hazard on CA-4 Westbound east of San Jose Ave (Antioch). Left lane affected. Expect delays.

Contra Costa 3 weeks, 1 day ago

CHP : Traffic Collision on CA-4 Westbound exiting at Somersville Rd (Antioch). Off Ramp affected. Expect delays.

Contra Costa 4 weeks, 1 day ago

CHP : Traffic Hazard on CA-4 Westbound east of San Joaquin County Line (Byron). Lanes affected. Expect delays.

Contra Costa 4 weeks, 1 day ago

CHP : Disabled vehicle on CA-4 Westbound west of Balfour Rd (Antioch). Right lane blocked. Expect delays.

Contra Costa 1 month ago

CHP : Traffic Collision on CA-4 Westbound at L St (Antioch). On Ramp affected. Expect delays.

Contra Costa 1 month ago

CHP : Traffic Hazard on CA-4 Westbound ramp to I-80 E (Hercules). Right lane affected. Expect delays.

Contra Costa 1 month, 2 weeks ago

CHP : Severe traffic alert on CA-4 Westbound west of San Joaquin County Line (Byron). Lane affected. Expect delays.

Contra Costa 1 month, 2 weeks ago

CHP : Traffic Hazard on CA-4 Southbound ramp to CA-242 S (Concord). Connector ramp affected. Expect delays.

Contra Costa 1 month, 2 weeks ago

CHP : Residual delays on CA-4 Westbound east of San Jose Ave (Antioch). Right shoulder affected. Expect delays.

Contra Costa 1 month, 3 weeks ago

CHP : Traffic Hazard on CA-4 Westbound west of CA-242 N (Concord). Left lanes affected. Expect delays.

Contra Costa 1 month, 3 weeks ago

CHP : Traffic Hazard on CA-4 Westbound entering at Sand Creek Rd (Brentwood). On Ramp affected. Expect delays.

Contra Costa 1 month, 3 weeks ago

CHP : Traffic Hazard on CA-4 Westbound ramp to I-80 W (Hercules). Left lane blocked. Expect delays.

Contra Costa 2 months ago

CHP : Traffic Hazard on CA-4 Westbound at Byron Hwy (Brentwood). Center lanes affected. Expect delays.

Contra Costa 2 months ago

CHP : Grass fire on CA-4 Westbound entering at L St (Antioch). On Ramp affected. Expect delays.

Contra Costa 2 months ago

CHP : Traffic Hazard on CA-4 Westbound exiting at Bailey Rd (Pittsburg). Off Ramp affected. Expect delays.

Contra Costa 2 months ago

CHP : Traffic Collision on CA-4 Westbound east of I-80 W (Hercules). Lane affected. Expect delays.

Contra Costa 2 months, 1 week ago

CHP : Traffic Hazard on CA-4 Westbound east of I-80 W (Hercules). Lane affected. Expect delays.

Contra Costa 2 months, 1 week ago

CHP : Severe traffic alert and Emergency roadwork on CA-4 Westbound at Lone Tree Way Bypass (Antioch). Right lane closed. Expect delays.

Contra Costa 2 months, 1 week ago

CHP : Traffic Collision with Injuries on CA-4 Westbound at Alhambra Ave (Martinez). Right lane and exit ramp blocked. Expect delays.

Contra Costa 2 months, 2 weeks ago

CHP : Disabled vehicle on CA-4 Westbound exiting at A St (Antioch). Off Ramp affected. Expect delays.

Contra Costa 2 months, 2 weeks ago

CHP : Traffic Hazard on CA-4 Westbound east of Sycamore Ave (Hercules). Center lanes affected. Expect delays.

Contra Costa 2 months, 3 weeks ago

CHP : Traffic Collision on CA-4 Westbound east of San Joaquin County Line (Byron). Lanes affected. Expect delays.

Contra Costa 2 months, 3 weeks ago

CHP : Grass fire on CA-4 Westbound exiting at Lone Tree Way Bypass (Antioch). Off Ramp affected. Expect delays.

Contra Costa 3 months ago

CHP : Traffic Hazard on CA-4 Westbound west of Arnold Industrial Way (Concord). Center lanes blocked. Expect delays.

Contra Costa 3 months, 1 week ago

CHP : Traffic Hazard on CA-4 Westbound east of CA-242 S (Concord). Left and center lanes blocked. Expect delays.

Contra Costa 3 months, 1 week ago

CHP : Traffic Hazard on CA-4 Westbound east of Sand Creek Rd (Brentwood). Left lanes blocked. Expect delays.

Contra Costa 3 months, 2 weeks ago

CHP : Traffic Collision on CA-4 Westbound south of Somersville Rd (Antioch). Off Ramp affected. Expect delays.

Contra Costa 3 months, 2 weeks ago

CHP : Disabled vehicle on CA-4 Westbound north of Arnold Industrial Way (Concord). Lanes blocked. Expect delays.

Contra Costa 3 months, 2 weeks ago

CHP : Traffic Hazard on CA-4 Westbound ramp to I-80 W (Hercules). Connector ramp blocked. Expect delays.

Contra Costa 3 months, 3 weeks ago

CHP : Traffic Hazard on CA-4 Westbound at Balfour Rd (Antioch). Right lane blocked. Expect delays.

Contra Costa 3 months, 3 weeks ago

CHP : Disabled vehicle and Traffic Hazard on CA-4 Westbound west of Alhambra Ave (Martinez). Lanes affected. Expect delays.

Contra Costa 3 months, 3 weeks ago

CHP : Traffic Collision on CA-4 Westbound east of Cummings Skwy (Port Costa). Lanes blocked. Expect delays.

Contra Costa 3 months, 4 weeks ago

CHP : Traffic Collision with Injuries on CA-4 Westbound entering at Sand Creek Rd (Brentwood). On Ramp blocked. Expect delays.

Contra Costa 4 months ago

CHP : Traffic Hazard on CA-4 Westbound south of Somersville Rd (Antioch). On Ramp blocked. Expect delays.

Contra Costa 4 months ago

CHP : Traffic Hazard on CA-4 Westbound east of CA-242 N (Concord). Center lanes blocked. Expect delays.

Contra Costa 4 months ago

CHP : Traffic Collision on CA-4 Westbound west of Bailey Rd (Pittsburg). Off Ramp affected. Expect delays.

Contra Costa 4 months ago

CHP : Traffic Collision on CA-4 Westbound east of San Jose Ave (Antioch). Lane affected. Expect delays.

Contra Costa 4 months, 1 week ago

CHP : Disabled vehicle on CA-4 Westbound at Balfour Rd (Antioch). On Ramp blocked. Expect delays.

Contra Costa 4 months, 1 week ago

CHP : Traffic Collision and Brush fire on CA-4 Westbound entering at Cummings Skwy (Port Costa). On Ramp closed. Expect delays.

Contra Costa 4 months, 2 weeks ago

CHP : Traffic Hazard on CA-4 Westbound entering at Willow Pass Rd (Concord). On Ramp blocked. Expect delays.

Contra Costa 4 months, 2 weeks ago

CHP : Traffic Collision with Injuries on CA-4 Westbound entering at Port Chicago Hwy (Concord). On Ramp blocked. Expect delays.

Contra Costa 4 months, 3 weeks ago

CHP : Traffic Collision on CA-4 Westbound east of I-80 E (Hercules). Left lane blocked. Expect delays.

Contra Costa 4 months, 3 weeks ago

CHP : Traffic Hazard on CA-4 Westbound ramp to CA-160 (Antioch). Connector ramp affected. Expect delays.

Contra Costa 4 months, 3 weeks ago

CHP : Disabled vehicle on CA-4 Westbound entering at Railroad Ave (Pittsburg). On Ramp blocked. Expect delays.

Contra Costa 4 months, 4 weeks ago

CHP : Residual delays on CA-4 Westbound at Balfour Rd (Antioch). Right shoulder affected. Expect delays.

Contra Costa 5 months ago