An ambulance was en route Wednesday afternoon after a traffic collision on eastbound State Route 4 between Willow Pass Road and San Marco Boulevard in Contra Costa County. The incident was reported at about 2:20 p.m. on the eastbound roadway near the Willow Pass Road on-ramp.
The California Highway Patrol classified the incident as a traffic collision requiring an ambulance response. The dispatch information did not specify how many vehicles were involved or whether anyone was injured.
At approximately 3:29 p.m., CHP requested Antioch police assistance, with an estimated arrival time of eight minutes. The request was made for officer safety while the collision scene was being handled.
The available dispatch information did not identify a cause of the collision or provide details about lane closures, vehicle damage, or traffic delays. No additional vehicle descriptions or later scene developments were included in the CHP update.
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