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SANTA CLARITA, Los Angeles County, Calif., Sept. 24, 2026 — Multiple vehicles collided in the early hours of Wednesday, September 23, on southbound State Route 14 near Agua Dulce Canyon Road in Santa Clarita, according to the California Highway Patrol. A big rig and a passenger car overturned in the crash, and the truck was reported to be leaking fuel.
The California Highway Patrol's traffic log describes an older pickup truck colliding with a Honda Civic, followed by a separate collision involving a light-colored vehicle and a dark-colored vehicle that struck the side of the mountain along the roadway. A black sedan came to rest on its roof, and radio traffic noted that vehicles involved were reportedly engaged in a speed contest or exhibition of speed activity, in violation of California Vehicle Code 23109, before the crash occurred. That detail has not been independently confirmed and remains under investigation.
Los Angeles County Fire Department units responded to the scene, according to dispatch communications. The overturned tractor-trailer was reported leaking fuel, prompting close coordination between fire crews and the CHP as tow operators were called in to clear the wreckage.
All southbound lanes of SR-14 were shut down for a time as crews worked the scene, and the CHP issued a SigAlert lasting about an hour while the number 3 lane remained blocked during recovery operations. Lanes were reopened in stages, with the number 1 and number 2 lanes restored before the number 3 lane, as tow crews from Town Center Tow and Freeway Towing worked to remove the vehicles. Injuries were reported among those involved, though the number and severity have not been released.
The CHP has not confirmed how many people were hurt or provided further detail on the cause. The incident remains under investigation.
We hope everyone who was hurt makes a full and speedy recovery.
How Investigators Piece Together a Multi-Vehicle Freeway Crash
When several vehicles collide on a freeway, especially one involving a rollover and a possible mountainside impact, officers first have to stabilize the scene before they can determine what happened. That means checking for fuel leaks, coordinating with fire crews, and getting injured people to hospitals before any detailed reconstruction work can begin. Only after the roadway is safe can investigators start measuring skid marks, photographing vehicle positions, and collecting debris.
Determining whether speed or reckless driving played a role usually takes longer than the public expects. Investigators may review witness statements, black box data from involved vehicles, and any available video before concluding contributing factors like speed contests or exhibition driving. A preliminary report can take days, and a completed investigation, especially one that involves potential criminal conduct, usually takes weeks or longer.
Names of those involved are typically withheld until next of kin have been notified, a process that can take time if identification is difficult or family members live out of the area. Toxicology results, when relevant, can take several weeks to come back from a lab. This is standard practice across law enforcement agencies and is not a sign that anything unusual occurred; it simply reflects how much verification goes into a final, accurate report.
Frequently Asked Questions
What is an underride crash?
An underride crash happens when a smaller vehicle slides partially or fully beneath a larger truck or trailer during a collision, usually causing severe damage because the smaller vehicle's safety structures are not designed to absorb impact at that height.
What are common causes of large-truck accidents?
Large-truck crashes are frequently linked to driver fatigue, following distances that are too short, mechanical failure, poor weather, and unsafe speed, including speed contests or aggressive driving by other vehicles sharing the road.
How can drivers share the road with trucks safely?
Giving trucks extra following distance, avoiding a truck's blind spots, and passing quickly and predictably all reduce risk. Trucks take longer to stop and have larger blind spots than passenger cars.
Does driver fatigue contribute to truck crashes?
Yes. Fatigue is a recognized factor in a meaningful share of large-truck crashes, particularly during overnight and early-morning hours when drivers' alertness naturally dips.
According to the Insurance Institute for Highway Safety, 24 percent of fatally injured occupants in crashes classified as other, which were mostly rollovers, were belted in 2023.
What to Do After a Multi-Vehicle Crash in Santa Clarita, CA
If you're involved in or witness a multi-vehicle crash, move to a safe location away from traffic if you're able to do so and call 911 right away. Even if injuries seem minor, a medical evaluation is worth getting, since some injuries from a rollover or high-speed impact don't show symptoms right away.
Cooperate with responding officers and provide an honest account of what you saw or experienced. If you're a bystander, avoid speculating about fault to others at the scene; let investigators do their work. For those who have lost a loved one in a crash like this, know that agencies typically prioritize notifying family before releasing names publicly, and it is normal for full details to take time.
