What are the signs of a drowsy driver?

Frequent yawning and heavy eyelids are clear indicators of a drowsy driver. These signs suggest that the individual is experiencing fatigue, which can significantly impair their ability to operate a vehicle safely. Yawning is a physiological response to tiredness, often occurring when the body is in need of sleep. Similarly, heavy eyelids can indicate that a driver is struggling to keep their eyes open, a serious concern on the road. These signs highlight the body's natural reaction to fatigue, alerting both the driver and others on the road about the potential for impaired driving performance.

The other choices do not serve as indicators of drowsiness. Listening to music, for instance, can actually help some people stay alert while driving, while having the windows down can create a refreshing environment that may increase alertness. Using cruise control, on the other hand, does not inherently signal drowsiness; it is a feature designed to maintain a set speed but may lead to complacency if a driver is already fatigued. Therefore, recognizing the signs of drowsiness is crucial for ensuring safe driving practices.