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SAN CLEMENTE, San Diego County, Calif., Oct. 9, 2026 — A crash involving at least four vehicles shut down lanes on southbound Interstate 5 Thursday morning, October 8, near the San Onofre nuclear plant. The California Highway Patrol reported the collision around 8:24 a.m.
The crash involved a large truck, two sedans and an SUV, according to the report. It blocked lanes 3 and 4 of the southbound freeway, backing up traffic near the plant.
The crash remains under review. We wish those injured a swift and full recovery.
Why Multi-Vehicle Crashes Involving Trucks Happen on Freeways Like I-5
Large trucks move differently than passenger cars, and that difference shows up most in heavy freeway traffic. A loaded truck can weigh 20 to 30 times more than a sedan, so when traffic slows suddenly, the truck needs far more distance to stop. If a driver ahead brakes hard, a truck following too closely may not be able to stop in time, pushing it into the vehicles in front.
Merging and lane changes add another layer of risk. Trucks have wide blind spots along both sides and the rear, and a car that lingers in one of those spots can go unseen during a lane change. On a corridor like I-5, where lanes narrow near construction, interchanges or coastal curves, a truck shifting lanes at the wrong moment can clip or squeeze a smaller vehicle, setting off a chain reaction involving several cars.
Rollover risk is also particular to trucks. Their higher center of gravity means a sharp swerve, an overcorrection, or a tire blowout can tip a truck onto its side well before a car in the same situation would lose control. When that happens in a travel lane, it can block multiple lanes at once and draw in vehicles that have no time to react.
Frequently Asked Questions
Does driver fatigue play a role in truck crashes?
Yes. Long hours behind the wheel are a known factor in commercial truck crashes, and federal rules limit how many hours a driver can be on duty, though fatigue still contributes to many collisions.
What should I do if I'm in a crash with a commercial truck?
Move to a safe spot if possible, call 911, and let law enforcement document the scene. Get the truck driver's name, employer and insurance information, and seek a medical check even if you feel fine, since some injuries take hours to appear.
Why do trucks need so much distance to stop?
Weight and momentum. A fully loaded truck can take twice the distance or more to stop compared to a car traveling at the same speed, which is why sudden slowdowns in traffic are especially dangerous around them.
What makes truck crashes more dangerous than typical car accidents?
The size and weight gap between a truck and a passenger vehicle means the smaller vehicle absorbs most of the force. According to the National Highway Traffic Safety Administration, 2,979 passenger-car occupants were killed in two-vehicle crashes involving a passenger car and a light truck in 2023.
What to Do After a Multi-Vehicle Truck Crash in San Clemente, CA
If you're involved in a multi-vehicle crash on the freeway, stay in your vehicle with your seatbelt on if it's not safe to exit, and turn on hazard lights. Call 911 and wait for CHP or paramedics instead of trying to move vehicles yourself unless they're blocking active traffic and it's safe to do so.
Once you're clear of the scene, get checked by a medical provider even for minor aches, since whiplash and soft-tissue injuries can take a day or more to show symptoms. Keep copies of any police report number, photos of the scene, and contact information for other drivers and witnesses in case you need them later.
