Drivers with poor or insufficient sleep, or those who drive for long periods of time, are prone to fatigue, fatigue will affect the driver's attention, sensation, perception, thinking ability, sense of judgment, will power, decision-making power and sports ability, etc. . If the driver continues to drive after fatigue, the driver will feel sleepy and Drowsy, the body limbs are weak, the attention is not concentrated, the judgment ability drops, even will appear some absentminded or the instantaneous memory to disappear, the hand and foot movement is delayed or premature, there are dangerous and other unsafe factors in the operation, and traffic accidents are more likely to occur.