Accident Moderate Severity Active

CHP : Traffic Collision with Injuries on CA-4 Westbound east of Byron Hwy (Brentwood). Right shoulder affected. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on August 30, 2026 at 12:21 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Aug 29, 5:21 PM

Last Updated

7 minutes ago

Aug 29, 6:15 PM

Coordinates

37.8965, -121.6414

Update History

2 observations

CHP : Traffic Collision with Injuries on CA-4 Westbound east of Byron Hwy (Brentwood). Right shoulder affected. Expect delays. Aug 29, 5:30 PM

CHP : Traffic Collision with Injuries on CA-4 Westbound east of Byron Hwy (Brentwood). Right shoulder affected. Expect delays. Aug 29, 5:00 PM

Source: 511_sfbay · ID 511.org/1542641 First seen Aug 29, 2026 5:00 PM