Accident High Severity Resolved

CHP : Traffic Hazard 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 September 27, 2026 at 2:39 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Sep 27, 7:39 AM

Last Updated

1 month ago

Sep 27, 8:15 AM

Resolved

Sep 27, 2:15 PM

Coordinates

37.8903, -121.5694

Update History

1 observations

CHP : Traffic Hazard on CA-4 Westbound east of San Joaquin County Line (Byron). Lanes affected. Expect delays. Sep 27, 7:45 AM

Source: 511_sfbay · ID 511.org/1555480 First seen Sep 27, 2026 7:45 AM