What is a common sign of drowsy driving?

Answer: B — Frequent yawning or heavy eyelids

Frequent yawning or heavy eyelids is a common sign of drowsy driving and indicates a lack of alertness. When a driver is becoming fatigued, these physical symptoms often manifest, suggesting that the person's body is signaling a need for rest. Drowsiness decreases reaction times and impairs decision-making abilities, making it dangerous to continue driving in such a state. In contrast, increased alertness and clear and focused driving signify that a driver is attentive and fully awake, which are the opposite of drowsy driving. Accelerated speed can be associated with aggressive driving behaviors, but it does not directly indicate drowsiness. Recognizing signs of fatigue is crucial for safety, as it can help prevent accidents caused by sleepy drivers.