An 18-wheeler accident is a crash involving a tractor-trailer (semi-truck). Fully loaded, one can weigh up to 80,000 lbs, about 20 times a typical car, so crashes are far more likely to be fatal. In 2024, 5,340 people died in U.S. large-truck crashes, and 608 died in Texas crashes involving commercial vehicles. Most of those killed were in the other vehicle.
18-wheeler accident statistics
- Large-truck crash deaths fell from 5,969 in 2022 to 5,478 in 2023 and 5,340 in 2024, but are still about 58% higher than in 2009.
- Large trucks were involved in about 14% of all U.S. traffic deaths in 2024.
- Only about 30% of large-truck crash deaths happen on interstates and freeways; more than half occur on other major roads.
- Nearly half (47%) of large-truck crash deaths happen between 6 a.m. and 3 p.m., when trucks are most active.
- In Texas, Harris County had the most commercial-vehicle crashes in 2024 (6,313), followed by Dallas (3,857), Bexar (2,684) and Tarrant (1,716).
Sources: IIHS, Large trucks fatality facts (2024 data); TxDOT, CMV-involved crashes by county, 2024. More Texas data: Texas truck crash statistics.
Common causes of 18-wheeler crashes
| Cause | What to look for |
|---|---|
| Fatigue and hours-of-service violations | ELD logs showing driving beyond the 11-hour limit or 14-hour window. Federal HOS rules |
| Speed and following distance | Engine control module (black box) data on speed, braking and cruise control. Truck black box data |
| Distraction | Phone records, in-cab camera footage, dispatch messages |
| Brake, tire and lighting defects | Inspection reports, DVIRs, maintenance files, out-of-service history |
| Cargo loading | Overweight or shifting loads, causing rollovers and jackknifes. Scale tickets and bills of lading |
| Wide turns and blind spots | Lane-change and right-turn crashes in the truck's "no-zones" |
| Unqualified or impaired drivers | Driver qualification file, medical certification, drug and alcohol test results |
See common causes and the evidence that proves them.
Types of 18-wheeler accidents
- Rear-end collisions: a loaded truck needs far more distance to stop than a car.
- Jackknife accidents: the trailer swings out at an angle to the cab, often blocking several lanes.
- Underride crashes: a car slides under the trailer's rear or side; among the deadliest.
- Rollovers: often on ramps and curves, linked to speed and load height.
- Wide-turn and blind-spot crashes: especially at city intersections.
- Tire blowouts and lost loads: debris and loss of control on highways.
Who can be responsible
Unlike most car crashes, an 18-wheeler crash can involve several companies: the driver, the motor carrier, the owner of the tractor or trailer, a freight broker, the shipper or loader, a maintenance contractor and parts manufacturers. Texas divides fault by percentage under CPRC Chapter 33. Read who can be liable in a Texas truck accident.
Federal law requires interstate carriers to carry at least $750,000 in liability insurance, and more for hazmat. See trucking insurance requirements.
What happens after an 18-wheeler crash
- At the scene: police investigate and complete a CR-3 crash report; the truck driver may need post-accident drug and alcohol testing.
- The trucking company responds: carriers often send their own investigators and insurers quickly, sometimes within hours.
- Evidence: ELD data, black-box data and video can be overwritten, which is why preservation letters are sent early.
- The claim: injured people make a claim against the carrier's insurer. See the truck accident claim process.
- Deadline: in Texas, most injury lawsuits must be filed within two years. Use the deadline calculator.
Check the trucking company
Find the USDOT number on the truck's cab door or the crash report, then look it up in the free trucking company safety lookup to see its inspections, out-of-service rates, crashes and insurance filings.