Accident Moderate Severity Resolved

CHP : Traffic Collision on CA-4 Westbound east of San Joaquin County Line (Byron). Lane affected. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on September 30, 2026 at 4:08 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Sep 29, 9:08 PM

Last Updated

3 weeks, 6 days ago

Sep 29, 10:00 PM

Resolved

Sep 30, 4:15 AM

Coordinates

37.8900, -121.5559

Update History

1 observations

CHP : Traffic Collision on CA-4 Westbound east of San Joaquin County Line (Byron). Lane affected. Expect delays. Sep 29, 9:15 PM

Source: 511_sfbay · ID 511.org/1556648 First seen Sep 29, 2026 9:15 PM