Accident High Severity Resolved

CHP : Traffic Hazard on CA-4 Southbound ramp to CA-242 S (Concord). Connector ramp affected. Expect delays.

A high-severity accident was reported on CA-4 W near Contra Costa on September 11, 2026 at 12:42 AM.

Road

CA-4 W

Area

Contra Costa

Address

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Started

Sep 10, 5:42 PM

Last Updated

1 month, 2 weeks ago

Sep 10, 6:45 PM

Resolved

Sep 11, 1:00 AM

Coordinates

38.0046, -122.0370

Update History

2 observations

CHP : Traffic Hazard on CA-4 Southbound ramp to CA-242 S (Concord). Connector ramp affected. Expect delays. Sep 10, 6:30 PM

CHP : Traffic Hazard on CA-242 N-CA-4 W Ramp Westbound north of CA-242 N (Concord). Lane affected. Expect delays. Sep 10, 6:00 PM

Source: 511_sfbay · ID 511.org/1547650 First seen Sep 10, 2026 6:00 PM