Accident High Severity Resolved

CHP : Traffic Hazard on CA-4 Westbound entering at A St (Antioch). On Ramp blocked. Expect delays.

A high-severity accident was reported on CA-4 W near Contra Costa on May 5, 2026 at 2:07 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

May 4, 7:07 PM

Last Updated

1 month ago

May 4, 7:30 PM

Resolved

May 5, 1:30 AM

Coordinates

37.9985, -121.8057

Update History

1 observations

CHP : Traffic Hazard on CA-4 Westbound entering at A St (Antioch). On Ramp blocked. Expect delays. May 4, 7:15 PM

Source: 511_sfbay · ID 511.org/1490100 First seen May 4, 2026 7:15 PM