Accident High Severity Resolved

CHP : Traffic Hazard on CA-4 Westbound at Alhambra Ave (Martinez). On Ramp blocked. Expect delays.

A high-severity accident was reported on CA-4 W near Contra Costa on November 1, 2026 at 4:08 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Oct 31, 9:08 PM

Last Updated

1 day, 7 hours ago

Oct 31, 9:15 PM

Resolved

Nov 1, 2:30 AM

Coordinates

37.9900, -122.1339

Update History

1 observations

CHP : Traffic Hazard on CA-4 Westbound at Alhambra Ave (Martinez). On Ramp blocked. Expect delays. Oct 31, 9:15 PM

Source: 511_sfbay · ID 511.org/1571386 First seen Oct 31, 2026 9:15 PM