Accident High Severity Resolved

CHP : Traffic Hazard on CA-4 Westbound entering at Balfour Rd (Antioch). On Ramp affected. Expect delays.

A high-severity accident was reported on CA-4 W near Contra Costa on May 12, 2026 at 9:57 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

May 12, 2:57 PM

Last Updated

4 weeks ago

May 12, 4:00 PM

Resolved

May 12, 10:00 PM

Coordinates

37.9321, -121.7359

Update History

2 observations

CHP : Traffic Hazard on CA-4 Westbound entering at Balfour Rd (Antioch). On Ramp affected. Expect delays. May 12, 3:45 PM

CHP : Traffic Hazard on CA-4 Westbound entering at Balfour Rd (Antioch). On Ramp affected. Expect delays. May 12, 3:15 PM

Source: 511_sfbay · ID 511.org/1493502 First seen May 12, 2026 3:15 PM