Accident Moderate Severity Stale

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

A injury accident was reported on CA-4 W near Contra Costa on August 19, 2026 at 2:49 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Aug 19, 7:49 AM

Last Updated

56 minutes ago

Aug 19, 8:30 AM

Coordinates

37.9985, -121.8057

Update History

2 observations

CHP : Traffic Collision on CA-4 Westbound west of A St (Antioch). Lane affected. Expect delays. Aug 19, 8:15 AM

CHP : Traffic Collision on CA-4 Westbound west of A St (Antioch). Lane affected. Expect delays. Aug 19, 8:00 AM

Source: 511_sfbay · ID 511.org/1537728 First seen Aug 19, 2026 8:00 AM