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ONTARIO, San Bernardino County, Calif., Oct. 12, 2026 — A semi-truck ended up on its side early on Sunday morning, October 11, after a crash involving a car on eastbound Interstate 10 near the Interstate 15 interchange, according to the California Highway Patrol. One person was reported injured.
The crash was reported shortly before 12:30 a.m. in the connector area where the westbound I-10 to southbound I-15 transition road passes overhead. Radio traffic indicated the semi left the roadway and came down an embankment into a construction zone below the flyover, landing on its side in a dirt area near the structure.
A small sedan was also involved, which was described as off the roadway and smoking on the right shoulder. The truck driver was reported to have minor injuries, and the CHP said medical personnel and the Ontario Fire Department responded to the scene. One nearby witness reported seeing what appeared to be an explosion but said she could not confirm whether a fire broke out.
Caltrans crews were called out to assess the flyover structure, and dispatch notes indicated the construction area where the truck came to rest had no barrier separating it from the roadway above. Heavy-duty tow crews were requested to remove the truck given the extent of damage, and the wreck was confirmed hooked for towing early in the morning.
The CHP has not released further details on what led to the crash. The incident remains under investigation.
Our thoughts are with those who were injured, and we wish them a full recovery.
How Investigators Piece Together a Flyover Truck Crash
When a loaded semi-truck leaves an elevated roadway, investigators cannot rely on witness accounts alone. Officers first secure the scene, which often means shutting down lanes or ramps for hours while they document skid marks, debris fields, and the final rest positions of each vehicle. On a structure like a freeway connector, engineers may also need to inspect the roadway and guardrail for damage before it reopens to traffic.
Reconstructing how a truck went off the road typically involves measuring the vehicle's path, checking onboard data recorders, if any, and reviewing maintenance and driver logs. None of that happens in a single shift. Toxicology results, when samples are drawn, can take several weeks to come back from the lab, and a final written report that pulls it all together is usually not finished for a month or more.
Agencies also tend to hold back a driver's name until next of kin has been notified, which can take time if family lives out of the area. That gap between a crash and a public identification is standard practice, not a sign that something is being withheld. Families waiting on word are encouraged to stay in direct contact with the investigating agency rather than relying solely on news updates.
Frequently Asked Questions
Why do truck crashes tend to cause more damage than typical car accidents?
A loaded semi can weigh 20 to 30 times more than a passenger car, so even a low-speed impact can push a smaller vehicle off course or cause major structural damage. The size difference also means a truck's momentum carries much farther once it starts to roll or leave the roadway.
What are a truck's blind spots, and why do they matter?
Large trucks have wide blind spots along both sides, directly behind the trailer, and close in front of the cab. Drivers in those zones may not be visible to the truck driver at all, which is why passenger vehicles are advised to pass quickly and avoid lingering alongside a truck.
What is an underride crash?
An underride crash occurs when a smaller vehicle slides partly or fully beneath a truck's trailer during a collision, often because the trailer sits higher off the ground than a car's crumple zones are designed to withstand. These crashes can be especially severe because the car's safety structure may not engage as intended.
What typically causes large-truck crashes?
Common factors include driver fatigue, following too closely, mechanical failure such as brake or tire problems, and road conditions like construction zones or sudden lane changes. Investigators look at all of these when determining what happened in a specific case.
What to Do After a Truck Crash in Ontario, CA
If you are involved in or witness a truck crash, move to a safe location away from traffic if possible and call 911 right away. Even if injuries seem minor at the scene, it is worth getting a medical evaluation afterward, since some injuries from a collision with a large vehicle do not show symptoms immediately.
Keep a record of who responded, including the agency name and any report or incident number, since that information helps if you need to follow up later. If you were a passenger, driver, or witness, write down what you remember as soon as you can, while details are still fresh. For anyone in Ontario affected by this crash or a similar one, staying in touch with the responding agency is the most reliable way to receive updates as the investigation progresses.
