Accident Moderate Severity Active

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

A injury accident was reported on CA-4 W near Contra Costa on April 24, 2026 at 12:16 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Apr 23, 5:16 PM

Last Updated

5 minutes ago

Apr 23, 6:45 PM

Coordinates

37.8900, -121.5693

Update History

4 observations

CHP : Traffic Collision with Injuries on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays. Apr 23, 6:30 PM

CHP : Traffic Collision with Injuries on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays. Apr 23, 6:00 PM

CHP : Traffic Collision with Injuries on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays. Apr 23, 5:30 PM

CHP : Traffic Collision with Injuries on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays. Apr 23, 5:15 PM

Source: 511_sfbay · ID 511.org/1485285 First seen Apr 23, 2026 5:15 PM