A traffic collision with unknown injuries was reported at about 3:58 p.m. on Oct. 21, 2026, on the Contra Loma Boulevard on-ramp to eastbound State Route 4 in Contra Costa County. The California Highway Patrol listed the incident in its Contra Costa area.
The reported location was the Contra Loma on-ramp connecting to eastbound SR-4. CHP’s incident classification indicated that the status of any injuries was not known at the time of the dispatch.
The available dispatch information did not identify the vehicles involved or describe their positions on the ramp. It also did not specify whether emergency medical crews were sent to the scene.
The record provided no information about lane closures, traffic obstruction, towing activity or the circumstances leading to the collision. No additional dispatch updates were included.
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