Accident Moderate Severity Stale

CHP : Traffic Collision with Injuries on CA-4 Eastbound west of I-680 N (Martinez). Right lane blocked. Expect delays.

A injury accident was reported on CA-4 E near Contra Costa on August 20, 2026 at 11:07 PM.

Road

CA-4 E

Area

Contra Costa

Address

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Started

Aug 20, 4:07 PM

Last Updated

3 hours, 1 minute ago

Aug 20, 4:45 PM

Coordinates

37.9929, -122.0747

Update History

2 observations

CHP : Traffic Collision with Injuries on CA-4 Eastbound west of I-680 N (Martinez). Right lane blocked. Expect delays. Aug 20, 4:15 PM

CHP : Traffic Collision with Injuries on CA-4 Eastbound west of I-680 N (Martinez). Lane affected. Expect delays. Aug 20, 4:00 PM

Source: 511_sfbay · ID 511.org/1538484 First seen Aug 20, 2026 4:00 PM