What are four of the major causes of driver fatigue?

The four main causes of driving fatigue include insufficient sleep, prolonged continuous driving, monotonous driving environment, and poor physical condition. Insufficient sleep directly affects a driver's concentration and reaction speed; it is recommended that adults get 7 to 8 hours of sleep daily to ensure driving safety. Continuous driving for more than 4 hours without rest constitutes fatigued driving. Especially on roads with monotonous scenery such as highways, the brain tends to feel fatigued due to lack of stimulation, so it is advised to take a 15-minute break every 2 hours. Notably, elevated carbon dioxide levels caused by poor vehicle ventilation can also induce drowsiness; therefore, regular window ventilation or use of the external air circulation mode is recommended. These factors have a more pronounced effect during hot weather or nighttime driving, necessitating advance planning of rest stops according to road conditions.