Accident High Severity Resolved

CHP : Traffic Collision on CA-4 Westbound at L St (Antioch). On Ramp affected. Expect delays.

A high-severity accident was reported on CA-4 W near Contra Costa on September 22, 2026 at 5:34 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Sep 21, 10:34 PM

Last Updated

1 month ago

Sep 21, 10:45 PM

Resolved

Sep 22, 5:00 AM

Coordinates

38.0009, -121.8262

Update History

1 observations

CHP : Traffic Collision on CA-4 Westbound at L St (Antioch). On Ramp affected. Expect delays. Sep 21, 10:45 PM

Source: 511_sfbay · ID 511.org/1552797 First seen Sep 21, 2026 10:45 PM