REDWOOD CITY, San Mateo County, Calif., Oct. 1, 2026 — Multiple vehicles collided on Tuesday morning, September 29, on southbound Interstate 280 just north of Farm Hill Boulevard in Redwood City. At least one person was hurt and taken to a hospital.
The crash was first reported shortly after 8 a.m. as a collision involving a silver pickup and a dark colored sedan, the California Highway Patrol said. Within minutes, the wreck had grown to include a white pickup truck and a white sedan, with a third vehicle of unknown description also involved.
An ambulance was requested for a person described as a driver in a dark colored sedan who was reportedly holding their head and had an unknown injury. The extent of that injury has not been confirmed. Responders also noted at least one vehicle stopped in traffic lanes with occupants out of their cars near the crash site.
The collision blocked the first two lanes of southbound I-280 during the morning commute, snarling traffic in the area. It was not immediately clear how long the lanes remained closed.
The California Highway Patrol has not released a cause for the crash. The incident remains under investigation.
We hope those who were hurt recover fully and quickly.
Why Multi-Vehicle Pileups Build So Fast in Morning Commute Traffic
Crashes involving three or more vehicles tend to start small. One driver brakes hard, the car behind reacts late, and within seconds a chain reaction pulls in vehicles that had no warning at all. On a freeway moving at commute speed, drivers usually have less than a second to respond once brake lights appear ahead.
Dense, high-speed traffic compounds the problem. Vehicles are packed close together, visibility is limited by the cars directly ahead, and a single lane blockage can force sudden, unpredictable lane changes from drivers trying to avoid stopped traffic. Each new vehicle entering the scene adds risk for the people already stopped or out of their cars.
According to the National Highway Traffic Safety Administration, 28,595 large-truck occupants were injured in multi-vehicle crashes involving large trucks in 2023. The presence of pickups and larger vehicles in a pileup, as logged in this incident, adds mass and force to what might otherwise be a minor fender-bender.
Frequently Asked Questions
Why does following distance matter so much in highway crashes?
A longer gap between vehicles gives a driver more time to brake or steer around trouble ahead. At freeway speeds, even an extra second of following distance can be the difference between stopping safely and rear-ending the car in front.
Do secondary crashes frequently follow an initial wreck?
Yes. Once a collision blocks a lane, approaching traffic usually has little warning, and drivers swerving or braking hard can trigger a second, separate crash before the scene is cleared.
What makes multi-vehicle crashes difficult to investigate?
Investigators have to determine the order vehicles struck each other, which is harder when there are three or more cars involved, and witnesses describe the sequence differently. Physical evidence like skid marks and vehicle damage patterns usually has to fill in the gaps.
What to Do After a Multi-Vehicle Crash in Redwood City, CA
If you're involved in a pileup, try to stay inside your vehicle with your seatbelt on unless it's unsafe to do so, since standing in active lanes puts you at risk from other approaching traffic. Turn on hazard lights if your car is drivable and able to move safely.
Get checked by a medical professional even if you feel fine immediately afterward. Adrenaline can mask pain from neck, back, or head injuries that show up hours or days later. Exchange information with other drivers only when it's safe, and request a copy of the official report once it's available for insurance and documentation purposes.
