Accident Moderate Severity Stale

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

A injury accident was reported on CA-4 E near Contra Costa on August 4, 2026 at 2:06 PM.

Road

CA-4 E

Area

Contra Costa

Address

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Started

Aug 4, 7:06 AM

Last Updated

2 hours, 42 minutes ago

Aug 4, 7:30 AM

Coordinates

37.8901, -121.5809

Update History

6 observations

CHP : Traffic Collision with Injuries on CA-4 Eastbound at San Joaquin County Line (Byron). Lane blocked. Expect delays. Aug 4, 7:30 AM

CHP : Traffic Collision with Injuries on CA-4 Westbound at San Joaquin County Line (Byron). Lanes open. Expect delays. Aug 4, 7:15 AM

CHP : Traffic Collision with Injuries on CA-4 Westbound at San Joaquin County Line (Byron). Lanes open. Expect delays. Aug 4, 7:00 AM

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

CHP : Traffic Collision with Injuries on CA-4 Westbound at San Joaquin County Line (Byron). Lane affected. Expect delays. Aug 4, 6:15 AM

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

Source: 511_sfbay · ID 511.org/1530608 First seen Aug 4, 2026 6:00 AM