Accident Moderate Severity Resolved

CHP : Traffic Hazard on CA-4 Westbound east of Somersville Rd (Antioch). Lanes affected. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on September 8, 2026 at 9:32 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Sep 8, 2:32 PM

Last Updated

1 month, 2 weeks ago

Sep 8, 3:15 PM

Resolved

Sep 8, 9:30 PM

Coordinates

38.0035, -121.8355

Update History

2 observations

CHP : Traffic Hazard on CA-4 Westbound east of Somersville Rd (Antioch). Lanes affected. Expect delays. Sep 8, 3:15 PM

CHP : Traffic Hazard on CA-4 Westbound east of Somersville Rd (Antioch). Lanes affected. Expect delays. Sep 8, 2:45 PM

Source: 511_sfbay · ID 511.org/1546451 First seen Sep 8, 2026 2:45 PM