Accident Moderate Severity Resolved

CHP : Disabled vehicle on CA-4 Westbound east of San Joaquin County Line (Byron). Right shoulder affected. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on August 24, 2026 at 2:55 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Aug 23, 7:55 PM

Last Updated

2 months ago

Aug 23, 8:00 PM

Resolved

Aug 24, 2:15 AM

Coordinates

37.8903, -121.5694

Update History

2 observations

CHP : Disabled vehicle on CA-4 Westbound east of San Joaquin County Line (Byron). Right shoulder affected. Expect delays. Aug 23, 8:00 PM

CHP : Disabled vehicle on CA-4 Westbound east of San Joaquin County Line (Byron). Right shoulder affected. Expect delays. Aug 23, 7:45 PM

Source: 511_sfbay · ID 511.org/1539779 First seen Aug 23, 2026 7:45 PM