Accident Moderate Severity Resolved

CHP : Traffic Collision 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 May 1, 2026 at 1:32 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

May 1, 6:32 AM

Last Updated

5 months, 3 weeks ago

May 1, 7:15 AM

Resolved

May 1, 1:30 PM

Coordinates

37.8903, -121.5694

Update History

2 observations

CHP : Traffic Collision on CA-4 Westbound east of San Joaquin County Line (Byron). Lane affected. Expect delays. May 1, 6:45 AM

CHP : Traffic Collision on CA-4 Westbound east of San Joaquin County Line (Byron). Lane affected. Expect delays. May 1, 6:30 AM

Source: 511_sfbay · ID 511.org/1488711 First seen May 1, 2026 6:30 AM