Accident High Severity Active

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

A high-severity accident was reported on CA-4 W near Contra Costa on August 3, 2026 at 2:25 PM.

Road

CA-4 W

Area

Contra Costa

Address

Loading…

Started

Aug 3, 7:25 AM

Last Updated

2 minutes ago

Aug 3, 10:15 AM

Coordinates

37.8900, -121.5619

Update History

5 observations

CHP : Traffic Collision on CA-4 Westbound east of San Joaquin County Line (Byron). Lanes affected. Expect delays. Aug 3, 10:15 AM

CHP : Traffic Collision on CA-4 Westbound east of San Joaquin County Line (Byron). Lanes affected. Expect delays. Aug 3, 9:30 AM

CHP : Traffic Collision on CA-4 Westbound east of San Joaquin County Line (Byron). Lanes affected. Expect delays. Aug 3, 8:45 AM

CHP : Traffic Collision on CA-4 Westbound east of San Joaquin County Line (Byron). Lanes affected. Expect delays. Aug 3, 7:30 AM

CHP : Traffic Collision on CA-4 Westbound east of San Joaquin County Line (Byron). Lanes affected. Expect delays. Aug 3, 7:15 AM

Source: 511_sfbay · ID 511.org/1530144 First seen Aug 3, 2026 7:15 AM