What is a sign of a driver being fatigued?

Fatigue in drivers manifests through various physical and mental signs, and frequent yawning accompanied by heavy eyelids is a clear indicator of drowsiness. Yawning is a natural response to tiredness, and heavy eyelids convey a struggle to keep the eyes open, both of which can significantly compromise a driver's alertness and reaction times.

In contrast, enhanced focus on the road suggests that the driver is alert, which contradicts the fatigue being assessed. Increased speed could imply a lack of attention to safety, but it does not directly indicate fatigue. Loud music playing in the car might be a distraction, but it is not a reliable sign of a driver’s fatigue level. Recognizing signs of fatigue is critical for road safety, as they can lead to impaired driving ability and increase the risk of accidents.