Accident
High Severity
Resolved
CHP : Traffic Collision on CA-4 Eastbound entering at Somersville Rd (Antioch). On Ramp affected. Expect delays.
A high-severity accident was reported on CA-4 E near Contra Costa on July 27, 2026 at 11:55 PM.
Last Updated
11 hours, 48 minutes ago
Jul 27, 5:30 PM
Resolved
Jul 27, 11:30 PM
Coordinates
38.0024, -121.8329
Update History
3 observations
CHP : Traffic Collision on CA-4 Eastbound entering at Somersville Rd (Antioch). On Ramp affected. Expect delays.
Jul 27, 5:30 PM
CHP : Traffic Collision on CA-4 Eastbound entering at Somersville Rd (Antioch). On Ramp affected. Expect delays.
Jul 27, 5:15 PM
CHP : Traffic Collision on CA-4 Eastbound south of Somersville Rd (Antioch). Lane affected. Expect delays.
Jul 27, 5:00 PM
Source: 511_sfbay · ID 511.org/1527021
First seen Jul 27, 2026 5:00 PM