Accident Moderate Severity Resolved

CHP : Traffic Collision on CA-4 Westbound east of Lone Tree Way Bypass (Antioch). Left lane affected. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on April 21, 2026 at 12:06 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Apr 21, 5:06 AM

Last Updated

6 months, 1 week ago

Apr 21, 5:15 AM

Resolved

Apr 21, 11:30 AM

Coordinates

37.9663, -121.7391

Update History

1 observations

CHP : Traffic Collision on CA-4 Westbound east of Lone Tree Way Bypass (Antioch). Left lane affected. Expect delays. Apr 21, 5:15 AM

Source: 511_sfbay · ID 511.org/1484091 First seen Apr 21, 2026 5:15 AM