Accident Moderate Severity Stale

CHP : Traffic Collision with Injuries on CA-4 Westbound at Byron Hwy (Brentwood). Lane affected. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on August 13, 2026 at 11:25 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Aug 13, 4:25 AM

Last Updated

15 minutes ago

Aug 13, 5:00 AM

Coordinates

37.8965, -121.6413

Update History

2 observations

CHP : Traffic Collision with Injuries on CA-4 Westbound at Byron Hwy (Brentwood). Lane affected. Expect delays. Aug 13, 4:30 AM

CHP : Traffic Collision with Injuries on CA-4 Westbound east of Walnut Blvd (Brentwood). Lane affected. Expect delays. Aug 13, 4:15 AM

Source: 511_sfbay · ID 511.org/1534924 First seen Aug 13, 2026 4:15 AM