DALY CITY, San Mateo County, Calif., Oct. 4, 2026 — A multi-vehicle crash shut down lanes on northbound I-280 near John Daly Boulevard early on Saturday morning, October 3, according to the California Highway Patrol. At least one person was reportedly hurt, and an ambulance was sent to the scene.
The California Highway Patrol said the crash began as a two-vehicle collision north of Alemany Boulevard, with a vehicle left stationary in traffic. Within minutes, it had grown into a five-vehicle wreck spanning the center divider and the right shoulder, involving a motorcycle, a BMW, a Honda, and at least one other vehicle of undetermined make. Four people were reported standing outside their vehicles on the right shoulder as units arrived.
Emergency crews requested a fire response for visibility concerns on the southbound side opposite the wreck, and California Highway Patrol units closed lanes while the scene was cleared. A sergeant on scene described major axle damage to at least two vehicles, requiring separate flatbed tow trucks rather than standard tows.
The number one lane reopened by roughly 1 a.m., but the extent of injuries and the cause of the initial two-vehicle collision remain unclear. The California Highway Patrol has not released further details on how many people were hurt or transported.
We wish those injured a full recovery.
What Closing Speed and Vehicle Size Do to a Pileup on a Freeway Like I-280
A crash that starts with one stopped car rarely stays small on a freeway. What determines how far it spreads is the gap and the speed of the traffic arriving behind it. A driver following at a safe distance has time to brake or steer around a stopped vehicle. A driver following too close or moving too fast for the distance available runs out of road before they run out of speed and becomes the next vehicle in the chain.
Vehicle size and weight also shape what happens on impact. A motorcycle rider has no structure around them at all. A heavier sedan or SUV can push a lighter car further than it would otherwise travel, and a side impact, like a vehicle struck broadside, often causes more intrusion into the cabin than a frontal hit, because there is less material between the occupant and the striking vehicle.
According to the Insurance Institute for Highway Safety, 17,008 motor-vehicle crash deaths occurred outside passenger vehicles in crashes involving passenger vehicles in 2023. That figure reflects how much it depends on what a person is riding in or on when a crash reaches them, not just on how fast it happens.
Frequently Asked Questions
Why does following distance matter so much on the freeway?
The space between vehicles is the only buffer a driver has to react to a sudden stop ahead. A larger gap gives more time to brake smoothly rather than collide, which is often what keeps an initial incident from becoming a chain-reaction crash.
Do secondary crashes happen often after an initial wreck?
Yes. Traffic approaching a crash scene, especially at night or with reduced visibility, frequently strikes stopped vehicles or debris before drivers realize a collision has already occurred ahead.
What makes multi-vehicle crashes hard for investigators to sort out?
With several vehicles and drivers involved, investigators have to reconstruct the order of impacts, determine which collision occurred first, and account for each vehicle's speed and position before and after the collisions. That takes more time than a single two-car crash.
What typically causes a pileup involving several vehicles?
Common factors include a vehicle stopped or moving slowly in a travel lane, reduced visibility, and following traffic that lacks sufficient distance or time to react before reaching the scene.
What to Do After a Multi-Vehicle Crash in Daly City, CA
If you're involved in or come upon a multi-vehicle crash, try to move to the shoulder or a safe area away from traffic lanes if your vehicle is drivable. Turn on hazard lights and call 911 so responders know how many vehicles and people are involved. Even if you feel fine, a medical check is worth getting, since some injuries from a collision don't show symptoms right away. Exchange information with other drivers when it's safe, and request a copy of the official report once it's available for insurance or personal records.
