Accident Resolved

CHP : Severe traffic alert and Emergency roadwork on CA-4 Westbound between Sand Creek Rd (Brentwood) and Lone Tree Way Bypass (Antioch). Right lane closed. Expect delays.

A accident was reported on CA-4 W near Contra Costa on August 12, 2026 at 1:54 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Aug 11, 6:54 PM

Last Updated

2 months, 2 weeks ago

Aug 11, 9:15 PM

Resolved

Aug 12, 3:15 AM

Coordinates

37.9518, -121.7444

Update History

5 observations

CHP : Severe traffic alert and Emergency roadwork on CA-4 Westbound between Sand Creek Rd (Brentwood) and Lone Tree Way Bypass (Antioch). Right lane closed. Expect delays. Aug 11, 9:15 PM

CHP : Severe traffic alert and Emergency roadwork on CA-4 Westbound between Sand Creek Rd (Brentwood) and Lone Tree Way Bypass (Antioch). Right lane closed. Expect delays. Aug 11, 9:00 PM

CHP : Severe traffic alert and Emergency roadwork on CA-4 Westbound between Sand Creek Rd (Brentwood) and Lone Tree Way Bypass (Antioch). Right lane closed. Expect delays. Aug 11, 8:00 PM

CHP : Severe traffic alert and Emergency roadwork on CA-4 Westbound between Sand Creek Rd (Brentwood) and Lone Tree Way Bypass (Antioch). Right lane closed. Expect delays. Aug 11, 7:15 PM

CHP : Severe traffic alert and Emergency roadwork on CA-4 Westbound between Sand Creek Rd (Brentwood) and Lone Tree Way Bypass (Antioch). Right lane closed. Expect delays. Aug 11, 7:00 PM

Source: 511_sfbay · ID 511.org/1534196 First seen Aug 11, 2026 7:00 PM