A fully loaded semi can weigh up to 80,000 pounds. The car it hits usually weighs somewhere around 4,000. When physics like that meet on a highway, the result is rarely a fender bender. Truck and 18-wheeler crashes make up a small share of the wrecks on American roads, but they cause an outsized share of the deaths, and the legal aftermath looks nothing like a two-car collision on a side street. Federal trucking regulations, layered corporate insurance, and evidence that can vanish within days all come into play, often before a victim has even left the hospital.
This guide covers what's true nationally: the rules every commercial truck and driver operate under, who can end up legally responsible, what typically causes these crashes, and how the claims process differs from an ordinary car accident case. State law fills in some of the details, like how long you have to file suit, how fault gets divided, and what damages a jury can award, and those specifics are covered on our state-level pages. Here's the national picture.
How common and how deadly these crashes are
In 2023, 5,472 people died in crashes involving a large truck (any truck with a gross vehicle weight rating over 10,000 pounds), an 8% drop from 5,969 the year before, according to NHTSA's Fatality Analysis Reporting System.1 Another 153,452 people were injured that year.1 Seventy percent of the people killed were occupants of other vehicles, not the truck itself.1
Narrow that down to tractor-trailers specifically, the combination trucks most people mean by "18-wheeler," and the Insurance Institute for Highway Safety counts 4,354 deaths in 2023: 65% were passenger vehicle occupants, 17% were pedestrians, cyclists, or motorcyclists, and only 16% were people riding in the truck.2 A large truck driver is statistically safer behind the wheel than the average passenger vehicle driver, with 1.3 fatal crashes per 100 million miles traveled versus 1.6 for cars.2 That gap says something about who actually bears the physical cost of these wrecks. It's the people in smaller vehicles.
Large trucks account for about 5% of registered vehicles but 10% of all miles driven on U.S. roads,2 so they're disproportionately represented on interstates and long-haul corridors, the same roads where fatal crashes are most common.
The federal rulebook every truck operates under
Passenger car drivers answer mostly to state law. Commercial truck drivers and the companies they drive for answer to the Federal Motor Carrier Safety Administration too, and that federal layer becomes evidence in almost every serious truck crash case.
The hours-of-service rules at 49 CFR 395.3 cap how long a driver can be behind the wheel:3
- 11 hours of driving maximum, after 10 consecutive hours off duty
- A 14-hour window from the start of a shift, after which driving isn't allowed even if hours remain
- A required 30-minute break after 8 hours of driving
- 60 hours on duty in 7 days, or 70 in 8 days, for carriers that don't run every day of the week
Since December 18, 2017, most carriers have had to log those hours electronically instead of on paper, using an electronic logging device wired into the truck's engine.4 That creates a timestamped record of exactly when a driver was moving, idling, or off duty, and it's often the first thing a truck accident lawyer subpoenas.
Drivers also need a commercial driver's license that meets the standards in 49 CFR Part 383, which carries its own disqualification rules for serious violations.5 After any crash involving a fatality, a citation, or a vehicle towed from the scene, federal rules require the carrier to test the driver for alcohol within 2 hours, and no later than 8, and for drugs within 32 hours.6 The trucks themselves are capped at 80,000 pounds gross weight on the Interstate System, with axle weights further limited by the federal bridge formula so a heavy load can't concentrate too much weight on too short a wheelbase.7
One rule that never happened: FMCSA and NHTSA spent close to a decade considering a mandate that would electronically cap truck speeds. Both agencies formally withdrew the proposal in July 2025, so speed limiter use remains voluntary for now.8
Why so many parties can end up on the hook
A car accident case usually has one defendant: the other driver. A truck accident case can have half a dozen.
The driver is the obvious one, but the motor carrier that put the truck on the road is usually the real target, and federal law makes that easier to establish than it might seem. Under 49 CFR 376.12, a carrier that leases a truck from an owner-operator must take "exclusive possession, control, and use" of the vehicle for the length of the lease.9 Courts have read that requirement to make the carrier a statutory employer, on the hook for the driver's negligence, even when the driver is technically an independent contractor. That closes off a defense that comes up constantly in trucking litigation.
Freight brokers, the companies that arrange for a shipment to move but never own or drive the truck, are a newer front. Brokers argued for years that federal law preempted any state negligence claim against them for carelessly choosing an unsafe carrier. The Ninth Circuit rejected that argument in Miller v. C.H. Robinson Worldwide, holding that the Federal Aviation Administration Authorization Act's "safety exception" preserves state negligence claims against brokers who negligently hire dangerous carriers.10 The Supreme Court declined to review that decision in 2022, so in much of the country a broker that hands a load to a carrier with a documented bad safety record can still be sued directly.
Beyond the driver, carrier, and broker, a claim can reach the shipper or loading company if improperly secured cargo caused the crash, the maintenance shop if a known defect went uncorrected, or a parts manufacturer if a tire, brake, or coupling failed. Sorting out which of these actually applies is usually the first job of a lawyer handling one of these cases.
What actually causes these crashes
Fatigue shows up constantly in the research. Truck drivers behind the wheel for more than 8 hours are about twice as likely to crash as those with less time on the road, and drivers who report hours-of-service violations are more likely to also report falling asleep while driving.2 When federal rules briefly allowed longer duty days in 2004, self-reported dozing among Pennsylvania truckers rose from 13% to 19% within two years.2
Mechanical failure plays a bigger role than most people assume. A study of North Carolina crashes found brake defects in 42% of the trucks involved, and trucks with severe brake problems were roughly three times more likely to be the cause of the crash.2 Skipped inspections and worn tires fall into the same category, and they're a common reason maintenance logs get subpoenaed alongside a truck's engine data.
Add the truck's blind spots on all four sides, the wide swing a big rig needs to complete a right turn, the much longer stopping distance of a loaded trailer, and unsecured or overloaded cargo, and you have most of the recurring fact patterns behind these crashes. Distracted and impaired driving happen too, though at lower rates than in passenger vehicle crashes, since commercial drivers face the testing rules described above.
Underride crashes and other collisions unique to big rigs
An underride crash happens when a smaller vehicle slides beneath a truck's trailer, often shearing off the car's roof and passenger compartment. A widely cited 1997 study estimated underride occurs in roughly half of all fatal crashes between passenger vehicles and the front, rear, or side of a large truck, split about 57% front, 22% rear, and 20% side.2
Rear underride guards have been required on trailers since the late 1990s, but crash testing by IIHS found that many of the original guards failed to stop underride at real-world impact speeds.11 NHTSA responded with an upgraded federal standard in 2022, raising the guard test speed from 30 to 35 mph, with compliance required by July 2024.12 Side underride guards, which a 2012 IIHS study found could prevent injury or death in roughly three-fourths of side-impact truck crashes, still aren't federally required on new trailers.11
Rollovers, jackknifes (where the trailer swings out and folds against the cab), and cargo-spill crashes round out the collision types that come up disproportionately in truck cases, and each tends to leave its own kind of physical evidence at the scene for a reconstruction expert to work from.
The insurance layer is bigger and more complicated
A typical auto policy carries liability limits in the tens of thousands of dollars. Interstate motor carriers hauling general freight have to carry at least $750,000 in liability coverage, and that minimum jumps to $1 million for carriers hauling oil or other listed hazardous substances, and to $5 million for the highest-risk hazmat classes like explosives and radioactive materials.13 Carriers have to file proof of that coverage with FMCSA before they're allowed to operate at all.13
A bigger policy limit comes with a correspondingly bigger fight over it. Trucking companies typically carry coverage across primary and excess layers, and many have their own risk management teams and defense counsel involved from the moment a crash is reported, sometimes with an investigator at the scene within hours. Anyone dealing with a truck company's insurer directly, without independent representation, is negotiating against people who do this for a living. Before signing anything or giving a recorded statement, it's worth talking to an attorney at our legal directory who handles commercial truck cases specifically.
Evidence has a shelf life
A car crash case usually relies on a police report, some photos, and witness statements. A truck crash case has all of that plus a layer of electronic evidence that can disappear fast. The engine control module, the truck's version of a black box, records speed, braking, throttle position, and other data from the moments before a crash, and carriers aren't required to hold onto it indefinitely. The electronic log showing the driver's hours works the same way. Federal rules only require carriers to keep basic accident register information, driver name, date, location, injuries, and fatalities, for 3 years,14 and the underlying dispatch records, maintenance logs, and driver files are often routine business records that get overwritten or purged well before that.
This is why attorneys in these cases move fast to send a preservation letter demanding the carrier hold onto everything: engine data, electronic logs, dashcam footage, dispatch communications, and maintenance records. Waiting even a few weeks can mean the difference between having that evidence and not having it at all.
State law still decides a lot of this
Federal regulation sets the safety floor, but state law decides what happens once a case reaches a courtroom. How long you have to file a lawsuit (a deadline that runs anywhere from one year to several depending on the state), whether your own partial fault reduces or bars your recovery, whether a jury can award punitive damages against a reckless carrier, and how a wrongful death claim gets structured all vary by state. A truck making an interstate run can also cross into a state with different comparative negligence rules than the one where the crash actually happened, and that can change how a case gets valued. That's where the state-specific pages on this site pick up the detail this national guide doesn't cover.
What to do after a crash with a commercial truck
The basics don't change from any other serious crash: get medical care, get a police report, and photograph the scene if you're able to. A few things are specific to truck cases:
- Get the truck's USDOT number and the carrier's name off the door or trailer before the truck is moved. FMCSA's public SAFER system lets anyone look up a carrier's registered safety record and insurance filings using that number, free of charge.15
- Don't give a recorded statement to the trucking company's insurer before talking to your own attorney.
- Ask a lawyer to send a preservation letter right away. The window to lock down engine and electronic log data is measured in days, not months.
- Keep a record of every medical provider you see and every day of work you miss. These cases tend to run long, and the paper trail matters later.
You can find an attorney experienced with commercial truck claims at our legal directory.
This article provides general information, not legal advice.
Sources
-
NHTSA, Traffic Safety Facts 2023 Data: Large Trucks, https://crashstats.nhtsa.dot.gov/Api/Public/ViewPublication/813717
-
IIHS, Large trucks research area, https://www.iihs.org/research-areas/large-trucks
-
49 CFR § 395.3, Maximum driving time for property-carrying vehicles, https://www.law.cornell.edu/cfr/text/49/395.3
-
FMCSA, General Information About the ELD Rule, https://www.fmcsa.dot.gov/hours-service/elds/general-information-about-eld-rule
-
49 CFR Part 383, Commercial Driver's License Standards; Requirements and Penalties, https://www.ecfr.gov/current/title-49/subtitle-B/chapter-III/subchapter-B/part-383
-
49 CFR § 382.303, Post-accident testing, https://www.law.cornell.edu/cfr/text/49/382.303
-
23 CFR § 658.17, Weight, https://www.law.cornell.edu/cfr/text/23/658.17
-
Federal Register, Federal Motor Vehicle Safety Standards; Federal Motor Carrier Safety Regulations; Parts and Accessories Necessary for Safe Operation; Speed Limiting Devices; Withdrawal, 90 Fed. Reg. (July 24, 2025), https://www.federalregister.gov/documents/2025/07/24/2025-13928/federal-motor-vehicle-safety-standards-federal-motor-carrier-safety-regulations-parts-and
-
49 CFR § 376.12, Lease requirements, https://www.law.cornell.edu/cfr/text/49/376.12
-
Miller v. C.H. Robinson Worldwide, Inc., 976 F.3d 1016 (9th Cir. 2020), https://www.courtlistener.com/opinion/4789965/allen-miller-v-ch-robinson-worldwide-inc/
-
IIHS, Truck underride guard ratings, https://www.iihs.org/topics/large-trucks/truck-underride
-
Federal Register, Federal Motor Vehicle Safety Standards; Rear Impact Guards, Rear Impact Protection, 87 Fed. Reg. 42188 (July 15, 2022), https://www.federalregister.gov/documents/2022/07/15/2022-14330/federal-motor-vehicle-safety-standards-rear-impact-guards-rear-impact-protection
-
49 CFR § 387.9, Financial responsibility, minimum levels, https://www.law.cornell.edu/cfr/text/49/387.9
-
49 CFR § 390.15, Assistance in investigations and special studies, https://www.law.cornell.edu/cfr/text/49/390.15
-
FMCSA, SAFER System, About, https://safer.fmcsa.dot.gov/About.aspx