Accident Moderate Severity Resolved

CHP : Traffic Collision on CA-4 Westbound exiting at A St (Antioch). Lane affected. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on October 20, 2026 at 12:57 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Oct 19, 5:57 PM

Last Updated

1 week ago

Oct 19, 6:00 PM

Resolved

Oct 20, 12:00 AM

Coordinates

37.9986, -121.8036

Update History

1 observations

CHP : Traffic Collision on CA-4 Westbound exiting at A St (Antioch). Lane affected. Expect delays. Oct 19, 6:00 PM

Source: 511_sfbay · ID 511.org/1565959 First seen Oct 19, 2026 6:00 PM