Commercial trucks represent roughly 5% of registered vehicles on U.S. roads, but they are involved in a disproportionate share of traffic fatalities. In 2024, 5,340 people died in large-truck crashes across the United States, according to the National Safety Council. An additional 161,201 people suffered injuries in those same crashes. That is one person killed and roughly 441 injured every single day by a collision involving a large commercial vehicle.
Understanding how these accidents happen, who is liable when they do, and what federal rules govern commercial carriers gives victims and their families a clearer picture of the legal landscape they are navigating after a crash. Federal regulations for large trucks cover everything from driver hours of service and vehicle weight limits to drug testing requirements and electronic logging device mandates. Sutliff & Stout resource on federal regulations for large trucks outlines the specific FMCSA requirements that apply to commercial carriers operating on U.S. highways, which become critical evidence in determining liability after a crash.
What Makes Commercial Truck Accidents Different from Car Accidents
The physics of a commercial truck collision are fundamentally different from a passenger vehicle accident. A fully loaded tractor-trailer can weigh up to 80,000 pounds under federal weight limits. The average passenger vehicle weighs around 4,000 pounds. That 20-to-1 weight ratio produces dramatically different injury outcomes when the two collide.
The National Safety Council reports that 70% of all deaths in large-truck crashes are occupants of other vehicles, not the truck. Passenger vehicle occupants are approximately eight times more likely to suffer fatal injuries in a collision with a commercial truck than the truck’s own driver. The mass, ground clearance, and braking distance of commercial vehicles create specific crash dynamics, including underride collisions where a passenger vehicle slides beneath a trailer, that produce catastrophic outcomes for the smaller vehicle’s occupants.
Fatal large-truck crashes have increased 30% over the past decade, according to NSC data. In 2024 alone, 120,724 large trucks were involved in crashes resulting in injury, a 5.4% increase from the prior year.
What Causes Most Commercial Truck Accidents
The Federal Motor Carrier Safety Administration has tracked the primary contributing factors in commercial truck crashes across multiple large-scale studies. Driver behavior accounts for the largest share of truck accident causes.
The most frequently documented causes include:
- Driver fatigue from violations of hours-of-service regulations, which limit how long commercial drivers can operate before mandatory rest periods
- Distracted driving, including cell phone use, dispatch system interaction, and navigation device operation while in motion
- Speeding and driving too fast for road or weather conditions
- Following distance violations that prevent adequate stopping distance for the truck’s weight and speed
- Improperly loaded or secured cargo that shifts during transit and causes handling loss
- Mechanical failures, particularly in braking systems, tires, and steering components
- Inadequate pre-trip inspections that allow defective equipment onto public roads
Drug and alcohol impairment accounts for a smaller percentage of commercial truck accidents than commonly assumed. FMCSA data attribute approximately 0.4% of incidents to illegal substance use and 0.3% to alcohol consumption. The more common driver factors are fatigue-related impairment and attention failures during long hauls.
Who Is Liable in a Commercial Truck Accident
Truck accident liability is more complex than standard vehicle collision liability because multiple parties may have contributed to the crash.
Potentially liable parties in a commercial truck accident include:
- The truck driver, for any direct negligence in vehicle operation
- The motor carrier, for negligent hiring, inadequate training, pressure to violate hours-of-service rules, or failure to maintain vehicles
- The trailer owner, if the trailer was defectively maintained, contributed to the accident
- The cargo loader, if improperly loaded freight caused the crash
- The truck or component manufacturer, if a defective part contributed to the crash
- A third-party maintenance contractor, if improperly performed service work, contributed to the crash
Identifying all potentially liable parties requires access to the truck driver’s logbook, the carrier’s maintenance records, the cargo manifest, the electronic logging device data, the black box data from the truck’s event data recorder, and the driver’s qualification file. Commercial carriers are required under FMCSA regulations to maintain these records, but many records are subject to destruction schedules that make early legal action critical in truck accident cases.
What Happens If a Trucking Company Violated FMCSA Regulations
FMCSA violations documented in the record of a crash significantly affect how liability is argued and settled. A carrier cited for hours-of-service violations, a driver with a disqualifying driving record who should not have been hired, or a truck with documented brake deficiencies on its pre-trip inspection log all create evidence of negligence that extends beyond the driver’s actions at the moment of impact.
The FMCSA assigns safety ratings to carriers, and carriers with unsatisfactory or conditional ratings may be operating despite documented compliance failures. The FMCSA’s Safety Measurement System (SMS) uses roadside inspection data, crash history, and investigation results to generate Compliance, Safety, and Accountability (CSA) scores across seven behavioral analysis categories. Carriers with persistently high CSA scores represent elevated risk on the road, and their records are publicly searchable.
What the Financial Impact of a Truck Accident Looks Like
The FMCSA estimates that the average cost of a commercial truck accident in which one person is injured amounts to $148,279, covering medical expenses, lost wages, and property damage. When a fatal trucking accident occurs, that average rises to $7.2 million per accident, reflecting long-term economic loss, wrongful death damages, and the full scope of harm to surviving family members.
Those averages do not reflect settlement values in cases involving gross negligence, regulatory violations, or catastrophic injury. Cases involving spinal cord injuries, traumatic brain injuries, or wrongful death frequently produce settlements and verdicts that exceed the per-incident average by significant margins, particularly when carrier negligence is well-documented.
What to Do Immediately After a Commercial Truck Accident
The actions taken in the hours and days after a commercial truck accident directly affect the strength of any subsequent claim.
- Seek medical attention immediately, even if injuries do not appear severe. Internal injuries, traumatic brain injuries, and spinal damage may not produce immediate symptoms.
- Document the scene before vehicles are moved, if it is safe to do so. Photograph the truck, the trailer, the license plate, the carrier’s DOT number on the truck door, road conditions, and vehicle positions.
- Obtain the police report number and follow up to get the full report once it is filed.
- Do not provide a recorded statement to the carrier’s insurance company before consulting an attorney. Insurance adjusters representing commercial carriers are experienced in minimizing settlement values and may use recorded statements against the claimant.
- Contact an attorney experienced in commercial truck litigation as quickly as possible. Evidence preservation, including electronic logging device data and black box data, requires prompt legal action before the carrier’s standard record retention schedule allows destruction.
How Rental Vehicles Factor Into Truck Accident Liability
Dry van trailers are the most common commercial freight trailer operating on U.S. highways. They carry general freight in an enclosed aluminum or steel body and account for the largest single category of trailers in commercial operation. A 2021 FMCSA analysis found that trucks carrying van or enclosed box cargo, the category that includes dry van configurations, were involved in 2,132 fatal crashes, representing 37.4% of all cargo-related fatal truck crashes.
Liability questions involving dry van trailers depend on whether the trailer was owned by the carrier, leased from a third-party provider, or operated under a trip-lease arrangement. When a company uses dry van trailer rental equipment from a third-party fleet, the maintenance responsibility and pre-trip inspection obligation are defined by the rental or lease agreement and by FMCSA regulations governing leased commercial motor vehicles.
Under 49 CFR Part 376, motor carriers operating leased equipment remain responsible for the vehicle’s safety compliance during the period of operation, regardless of who owns the trailer. A mechanical failure in a rented trailer that contributes to an accident creates liability questions that involve both the carrier operating the equipment and potentially the rental provider if a pre-existing defect was known or discoverable at the time of rental.