A significant number of highway crashes are attributable to driver drowsiness and fatigue. Drowsiness-related crashes can often cause more serious occupant injuries than crashes that are not related to driver drowsiness [291]. In order to better understand and curtail this problem, human factors researchers and engineers have studied the problem of driver drowsiness and fatigue in a variety of driving environments (for example, driving simulators). They have determined the behavioral characteristics associated with driver drowsiness and investigated the effectiveness of different mitigation strategies.
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