Fatigue is defined as the disinclination to continue participating in the task at hand. Even if a driver has had a good night’s rest and is not feeling tired per se, the act of driving can induce fatigue, particularly if the drive is long in duration and takes place in a relatively unchanging setting (e.g., a highway). Drivers who are fatigued will experience symptoms of tiredness, such as yawning, heavy eyelids, and potentially falling asleep.