Figure 2: Critical reasons for large trucks crash

• Decision: For example, the driver was driving too fast for conditions, misjudged the speed of other vehicles, or followed other vehicles too closely.
• 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.
• Non-Performance: The driver fell asleep, was disabled by a heart attack or seizure, or was physically impaired for another reason.
• Performance: For example, the driver panicked, overcompensated, or exercised poor directional control.

Source: The Large Truck Crash Causation Study; Federal Motor Carrier Safety Administration, Office of Research and Analysis, Publication No. FMCSA-RRA-07-017