Accident Moderate Severity Resolved

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

A injury accident was reported on CA-4 W near Contra Costa on September 18, 2026 at 5:48 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Sep 17, 10:48 PM

Last Updated

1 month, 1 week ago

Sep 17, 11:15 PM

Resolved

Sep 18, 5:30 AM

Coordinates

37.8965, -121.6413

Update History

1 observations

CHP : Traffic Collision on CA-4 Westbound north of Byron Hwy (Brentwood). Right shoulder affected. Expect delays. Sep 17, 11:00 PM

Source: 511_sfbay · ID 511.org/1551141 First seen Sep 17, 2026 11:00 PM