The majority of truck accidents are caused by negligence, either on the part of the driver or of the trucking company. According to a study by the Federal Motor Carrier Safety Administration and the National Highway Traffic Safety Administration, driver negligence is the critical reason for 87% of truck crashes. In a truck accident causation study involving 120,000 large truck crashes over a two-year period, 87% of the crashes were found to be caused by one of the following types of driver negligence:
- Non-Performance: The driver fell asleep, was disabled by a heart attack or seizure, or was physically impaired for another reason.
- Recognition: The driver was inattentive, was distracted by something inside or outside the vehicle, or failed to observe the situation adequately for some other reason.
- Decision: For example, the driver was driving too fast for conditions, misjudged the speed of other vehicles, or followed other vehicles too closely.
- Performance: For example, the driver panicked, overcompensated, or exercised poor directional control.

