Accident High Severity Stale

CHP : Traffic Collision with Injuries on CA-4 Eastbound entering at Lone Tree Way Bypass (Antioch). On Ramp blocked. Expect delays.

A high-severity accident was reported on CA-4 E near Contra Costa on May 21, 2026 at 3:20 PM.

Road

CA-4 E

Area

Contra Costa

Address

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Started

May 21, 8:20 AM

Last Updated

2 hours, 37 minutes ago

May 21, 8:30 AM

Coordinates

37.9572, -121.7449

Update History

1 observations

CHP : Traffic Collision with Injuries on CA-4 Eastbound entering at Lone Tree Way Bypass (Antioch). On Ramp blocked. Expect delays. May 21, 8:30 AM

Source: 511_sfbay · ID 511.org/1497682 First seen May 21, 2026 8:30 AM