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 July 15, 2026 at 1:29 PM.

Road

CA-4 W

Area

Contra Costa

Address

Loading…

Started

Jul 15, 6:29 AM

Last Updated

2 weeks ago

Jul 15, 6:30 AM

Resolved

Jul 15, 12:30 PM

Coordinates

37.8903, -121.5694

Update History

4 observations

CHP : Traffic Hazard on CA-4 Westbound east of San Joaquin County Line (Byron). Lane affected. Expect delays. Jul 15, 6:30 AM

CHP : Traffic Hazard on CA-4 Westbound east of San Joaquin County Line (Byron). Lane affected. Expect delays. Jul 15, 6:15 AM

CHP : Traffic Hazard on CA-4 Westbound east of San Joaquin County Line (Byron). Lane affected. Expect delays. Jul 15, 6:00 AM

CHP : Traffic Hazard on CA-4 Westbound east of San Joaquin County Line (Byron). Lane affected. Expect delays. Jul 15, 5:45 AM

Source: 511_sfbay · ID 511.org/1521263 First seen Jul 15, 2026 5:45 AM