Accident High Severity Resolved

CHP : Traffic Collision on CA-4 Westbound exiting at Somersville Rd (Antioch). Off Ramp affected. Expect delays.

A high-severity accident was reported on CA-4 W near Contra Costa on September 27, 2026 at 5:59 PM.

Road

CA-4 W

Area

Contra Costa

Address

Loading…

Started

Sep 27, 10:59 AM

Last Updated

4 weeks, 1 day ago

Sep 27, 11:45 AM

Resolved

Sep 27, 6:00 PM

Coordinates

38.0035, -121.8355

Update History

1 observations

CHP : Traffic Collision on CA-4 Westbound exiting at Somersville Rd (Antioch). Off Ramp affected. Expect delays. Sep 27, 11:15 AM

Source: 511_sfbay · ID 511.org/1555519 First seen Sep 27, 2026 11:15 AM