Vehicles were involved in a collision on eastbound State Route 4 near the Pacheco Boulevard off-ramp in Contra Costa County on Aug. 21, 2026. The incident was reported at approximately 3:54 p.m., according to California Highway Patrol dispatch information.
The collision occurred just west of Pacheco Boulevard, based on the CHP location description. A later dispatch update indicated that vehicles were in the center divider.
An ambulance was reported en route as part of the initial emergency response. CHP personnel also noted that the scene could be viewed from the westbound side of the highway.
A towing service was requested at approximately 3:56 p.m. The available dispatch information did not specify the number of vehicles involved, the extent of any injuries, or whether travel lanes were blocked.
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