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SAN RAMON, Contra Costa County, Calif., Oct. 28, 2026 — At least three vehicles collided Tuesday morning, October 27, on southbound Interstate 680 south of Bollinger Canyon Road, according to the California Highway Patrol. One lane was blocked as crews worked the scene.
The crash reportedly involved a Chevrolet Camaro, a Ford Mustang Mach-E and at least one other vehicle, possibly a Honda and a Tesla, the CHP's traffic log shows. One driver reportedly left the scene before officers arrived, according to the log, though that detail has not been independently confirmed.
A person was seen getting out of one of the vehicles and down on the ground near the roadway, the CHP log indicates. The agency initially classified the crash as one with injuries of unknown severity before updating it to minor injuries. Firefighters from the San Ramon Valley Fire Protection District responded to the scene, the log shows.
Tow trucks were called for at least two of the vehicles, including one described as having major front-end damage, according to the CHP. The California Highway Patrol's Freeway Service Patrol also responded and later closed out its portion of the incident.
Further details on the number of people hurt and the cause of the crash were not available as of Tuesday. The CHP has not said whether any citations or an investigation into the driver who reportedly left the scene are pending.
We hope everyone who was hurt makes a full and speedy recovery.
Intersection Safety in California
The multi-vehicle crash was reported at Interstate 680 and Bollinger Canyon Road in San Ramon. Readers following crash news in Contra Costa County can find more about intersections across the state on our guide to California intersections.
Frequently Asked Questions
What typically causes a multi-vehicle pile-up like this one?
These crashes often start with one vehicle braking suddenly or losing control, triggering a chain reaction as following drivers can't stop in time, especially in heavier freeway traffic.
Why do chain-reaction crashes happen on freeways?
Short following distances and limited reaction time mean one sudden stop can trigger several impacts in seconds, particularly in a lane that's already congested or narrowed by an earlier incident.
What should I do if I'm stopped near a crash on the highway?
Stay in your vehicle if it's safe to do so, turn on hazard lights, and watch for approaching traffic. If you must get out, move well away from traffic lanes and barriers.
What to Do After a Multi-Vehicle Crash in San Ramon, CA
If you're involved in a multi-car crash, check yourself and any passengers for injuries before doing anything else, and call 911 if anyone is hurt. Move to a safe spot away from moving traffic if your vehicle is drivable and it's safe to do so. Exchange information with other drivers, take photos of the scene and vehicle damage, and get the names of any responding officers or agencies. Even if you feel fine, consider getting checked by a doctor afterward, since some injuries, especially to the neck or back, don't show symptoms right away. Keep copies of any CHP or police report for your records.
