Accident High Severity Resolved

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

A high-severity accident was reported on CA-4 W near Contra Costa on October 4, 2026 at 10:37 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Oct 4, 3:37 PM

Last Updated

3 weeks, 1 day ago

Oct 4, 4:00 PM

Resolved

Oct 4, 10:15 PM

Coordinates

37.9407, -121.7400

Update History

1 observations

CHP : Traffic Hazard on CA-4 Westbound east of San Jose Ave (Antioch). Left lane affected. Expect delays. Oct 4, 4:00 PM

Source: 511_sfbay · ID 511.org/1558926 First seen Oct 4, 2026 4:00 PM