Which of the following symptoms indicates a driver may be drowsy?

Frequent yawning is a well-known symptom that indicates a driver may be drowsy. Yawning is a natural physiological response that the body exhibits when it's in need of rest or is signaling a lack of alertness. When someone is drowsy, their body reacts by yawning to send more oxygen to the brain and, in some cases, to try to prolong wakefulness temporarily. If a driver is yawning frequently, it suggests that they are not fully awake and might be struggling to maintain attention on the road, which can significantly increase the risk of an accident.

Listening to loud music, high alertness, and immediate responsiveness are typically signs of a driver being engaged and alert. Loud music may actually help keep some drivers awake, while high alertness and immediate responsiveness indicate an attentive and active driver who is aware of their surroundings. Therefore, these symptoms do not indicate drowsiness but rather the opposite.