Accident Moderate Severity Resolved

CHP : Traffic Hazard on CA-4 Westbound east of Somersville Rd (Antioch). 3rd lane from the left blocked. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on May 20, 2026 at 2:29 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

May 20, 7:29 AM

Last Updated

1 day, 3 hours ago

May 20, 8:00 AM

Resolved

May 20, 2:00 PM

Coordinates

38.0039, -121.8371

Update History

2 observations

CHP : Traffic Hazard on CA-4 Westbound east of Somersville Rd (Antioch). 3rd lane from the left blocked. Expect delays. May 20, 7:45 AM

CHP : Traffic Hazard on CA-4 Westbound east of Somersville Rd (Antioch). Lane blocked. Expect delays. May 20, 7:30 AM

Source: 511_sfbay · ID 511.org/1497087 First seen May 20, 2026 7:30 AM