DALY CITY, San Mateo County, Calif., Sept. 17, 2026 — Two vehicles collided Thursday morning, September 17, on the on-ramp from John Daly Boulevard to southbound I-280, according to authorities. At least one person was reported injured and an ambulance was requested.
The crash involved a gray Toyota Camry and a white SUV, according to California Highway Patrol dispatch logs. The collision happened around 6:15 a.m. on the ramp connecting John Daly Boulevard to southbound I-280 in Daly City.
Daly City police first notified authorities of the crash, and the CHP incident was later updated to reflect a report of injuries. A Freeway Service Patrol unit was requested at the scene to help manage traffic. Fire personnel arrived and were reported blocking the right lane while crews worked at the scene.
By around 6:50 a.m., authorities reported the roadway had been cleared and traffic was moving again. The extent of any injuries has not been released. It is not yet known what led to the collision, and the incident remains under review.
We hope those who were hurt recover fully and quickly.
What Does Reduce On-Ramp Collisions?
Crashes at freeway on-ramps come down to a mismatch between speed and available stopping distance. Merging traffic has to match the pace of the freeway while judging gaps, and any delay in braking, whether from following too closely or from a wet or uneven road surface, turn a routine merge into a collision. Ramp geometry matters too: a short, curved, or poorly lit ramp gives drivers less time to react.
Engineering fixes have shown real results. Ramp metering signals that space out entering vehicles, extended acceleration lanes, and better ramp lighting all give drivers more room and more visibility to adjust speed before merging. Rumble strips and clearer lane markings on ramps also cut down on last-second lane changes that lead to side-swipe or rear-end crashes.
Weather and road surface conditions change how all of this plays out. A wet ramp surface can add significant distance to a vehicle's stop, and morning conditions like fog, glare, or dew can reduce visibility right at the point where drivers most need to judge closing speed. According to the Insurance Institute for Highway Safety, 17,008 motor-vehicle crash related deaths occurred in 2023, a reminder that people outside the vehicles involved, including first responders and pedestrians near a scene, also bear risk when a crash happens on a busy corridor.
Frequently Asked Questions
What typically causes on-ramps crashes?
Merging collisions at on-ramps are linked to following distance, speed differences between merging and through traffic, and limited visibility. Investigators generally look at vehicle speeds, road conditions, and driver actions before determining a cause.
How does speed affect how serious a crash is?
Higher speed reduces the time a driver has to react and increases the force involved in a collision. Even modest increases in speed can substantially raise the risk of injury in a crash.
Why is distracted driving especially risky in merging situations?
Merging requires a driver to judge gaps and closing speed quickly. Even a brief distraction, such as checking a phone, can mean missing a critical window to brake or adjust position.
Do weather and road conditions play a role in ramp crashes?
Yes. Wet, icy, or uneven pavement increases stopping distance, and low light or glare can make it harder to judge the speed of other vehicles, both of which are relevant to ramp and merge crashes.
What to Do After a Car Accident in Daly City, CA
If you're involved in a crash on a freeway ramp or busy roadway in Daly City, try to move to a safe location if the vehicle is drivable and it's safe to do so. Turn on hazard lights and call 911 to report the collision and any injuries.
Even if you feel fine, it's wise to be checked by a medical professional, since some injuries, particularly to the neck or back, aren't immediately obvious. Exchange information with the other driver, take photos of the vehicles and scene if possible, and request a copy of the police report once it's available for your records.
