Fatal Semi-Truck Crash on I-10: Investigation Begins

Fatal Semi-Truck Collision Shuts Down Westbound I-10 at I-15 in Ontario; Legal and Safety Guidance for Affected Families

Overview of the Ontario Crash

A fatal multi-vehicle collision involving two semi-trucks shut down the westbound lanes of Interstate 10 at the Interstate 15 interchange in Ontario on Tuesday afternoon, October 21, 2025. According to the California Highway Patrol, the crash occurred around 1:14 p.m. near the transition ramps and led to significant traffic disruption as emergency crews responded.

Witnesses reported that one of the big rigs appeared to brake but could not stop in time, colliding with another semi-truck. There are indications that a third vehicle may have been struck between the two trucks, though that detail remains under investigation. One of the trucks caught fire following the impact, with flames seen coming from its fuel tank before firefighters quickly extinguished the blaze.

Four lanes were initially blocked as authorities worked to secure the area, provide medical aid, and investigate. One person was transported to Pomona Valley Medical Center with major injuries. At least one fatality was confirmed at the scene. The identity of the deceased has not been released at this time, and the exact cause of the crash remains under investigation.

Why Semi-Truck Crashes Are Often Catastrophic

Collisions involving large commercial trucks frequently result in severe injuries and fatalities due to:
- Vehicle size and weight: Fully loaded big rigs can weigh 20–30 times more than passenger cars, resulting in more force on impact.
- Longer stopping distances: Trucks require more time and space to stop, particularly at highway speeds or on downhill grades.
- Fuel and fire risks: Large fuel tanks increase the potential for post-collision fires.
- Visibility limitations: Larger blind spots and longer trailers can obscure other vehicles during lane changes or in congested traffic.
- Cargo factors: Improperly secured or overloaded cargo can shift, affecting stability and braking.

Potential Factors Under Review in This Crash

While investigators will determine the exact causes, common factors assessed in serious truck crashes include:
- Speeding or following too closely in high-traffic transition areas.
- Brake failures or maintenance issues, including worn components or heat-related brake fade.
- Driver fatigue or hours-of-service violations.
- Distracted or impaired driving.
- Weather and visibility conditions at the time of the crash.
- Road design or construction zones affecting traffic flow.
- Cargo loading, weight distribution, and securement.

Evidence That Can Be Critical in Truck Accident Investigations

In major truck accidents, multiple sources of evidence can help reconstruct events and determine liability:
- Electronic data recorders (EDRs) and engine control modules (ECMs) that capture speed, braking, throttle, and fault codes.
- Onboard cameras and telematics systems from the truck and trailer.
- Driver logs, GPS data, dispatch communications, and bills of lading.
- Maintenance and inspection records for the truck and trailer.
- Post-crash drug and alcohol testing results where applicable.
- Photos, videos, and measurements from the scene, including skid marks, debris fields, and vehicle resting positions.

At Avian Law Group, we understand the heartbreak families face after losing a loved one in a fatal semi-truck accident. If you’ve lost a loved one in a semi-truck accident, Avian Law Group is here to help. Our skilled wrongful death attorneys understand the complexities of commercial trucking cases and the emotional toll these tragedies take on families. We will investigate the accident, determine liability, and fight aggressively to secure justice and compensation for your loved one. Contact Avian Law Group today for a free consultation with a compassionate and experienced semi-truck accident lawyer.