Available 
Available 
SAN YSIDRO, San Diego County, Calif., Nov. 10, 2026 — Three vehicles collided on southbound Interstate 805 near San Ysidro Boulevard on Monday evening, November 9, according to the California Highway Patrol. The crash blocked lanes of traffic and prompted a response from emergency crews.
The CHP said the wreck involved a blue Hyundai Sonata, a dark Nissan Sentra and a white Hyundai Santa Fe. Initial reports described three to four vehicles involved, and the crash blocked the right lanes before the wreckage was reported in the middle lanes and later in the number two lane as crews worked to clear the scene.
A dispatch log entry noted a medical response had been requested. Vehicles were being moved to the center divider as officers worked the scene.
The incident remains under investigation. Our thoughts are with those who were injured, and we wish them a full recovery.
Intersection Crashes in California
This multi-vehicle crash happened at I-805 and San Ysidro Boulevard in San Ysidro, CA. Our California intersections page covers intersection crashes across California.
Frequently Asked Questions
Are secondary crashes common after an initial wreck like this one?
Yes. Stopped or slowed traffic behind an earlier crash creates a hazard for approaching drivers, especially on busy interstates, and secondary collisions happen with some regularity when lanes are not cleared quickly.
What makes a multi-vehicle crash harder to investigate than a two-car crash?
Investigators have to establish the sequence of impacts among several vehicles, which usually takes longer than a standard two-vehicle collision and can involve input from multiple drivers and witnesses.
What typically causes a multi-vehicle pile-up?
Common factors include sudden braking, lane changes, reduced visibility and following too closely, though the specific cause in any given crash is determined by investigators rather than assumed.
