Accident Moderate Severity Resolved

CHP : Traffic Hazard 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 June 6, 2026 at 1:32 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Jun 5, 6:32 PM

Last Updated

4 days, 9 hours ago

Jun 5, 6:45 PM

Resolved

Jun 6, 1:00 AM

Coordinates

37.8914, -121.5702

Update History

1 observations

CHP : Traffic Hazard on CA-4 Westbound east of San Joaquin County Line (Byron). Lane affected. Expect delays. Jun 5, 6:45 PM

Source: 511_sfbay · ID 511.org/1504355 First seen Jun 5, 2026 6:45 PM