Accident Moderate Severity Resolved

CHP : Traffic Collision with Injuries on CA-4 Westbound ramp to CA-242 S (Concord). Left lane blocked. Expect delays.

A injury accident was reported on CA-4 W near Contra Costa on August 18, 2026 at 3:02 PM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Aug 18, 8:02 AM

Last Updated

1 day, 8 hours ago

Aug 18, 8:30 AM

Resolved

Aug 18, 2:45 PM

Coordinates

38.0098, -122.0234

Update History

2 observations

CHP : Traffic Collision with Injuries on CA-4 Westbound ramp to CA-242 S (Concord). Left lane blocked. Expect delays. Aug 18, 8:30 AM

CHP : Traffic Collision with Injuries on CA-4 Westbound ramp to CA-242 S (Concord). Right lane blocked. Expect delays. Aug 18, 8:15 AM

Source: 511_sfbay · ID 511.org/1537177 First seen Aug 18, 2026 8:15 AM