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 17, 2026 at 12:42 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Jun 16, 5:42 PM

Last Updated

13 hours, 17 minutes ago

Jun 16, 5:45 PM

Resolved

Jun 17, 12:00 AM

Coordinates

37.8903, -121.5694

Update History

1 observations

CHP : Traffic Hazard on CA-4 Westbound east of San Joaquin County Line (Byron). Lane affected. Expect delays. Jun 16, 5:45 PM

Source: 511_sfbay · ID 511.org/1509153 First seen Jun 16, 2026 5:45 PM