The five main signs of driving fatigue include frequent blinking or heavy eyelids, constant yawning, significantly slowed reaction time, unstable vehicle trajectory (such as frequent lane deviation or erratic speed), and difficulty concentrating (e.g., repeatedly checking the dashboard or missing traffic signals). These physiological and behavioral manifestations are direct reflections of the decline in brain and bodily functions, which are particularly prominent when driving continuously for more than 4 hours or resting for less than 20 minutes. Night driving or monotonous road conditions can accelerate the onset of fatigue, and individual differences may lead to variations in the timing of symptom appearance. Drivers are advised to take the initiative to rest for 15 minutes every 2 hours. Drinking caffeinated beverages can only relieve symptoms temporarily and cannot replace necessary sleep. Ensuring more than 7 hours of sleep before long-distance driving is the most effective way to prevent fatigued driving.
