Which of the following is a sign of fatigue while driving?

Frequent yawning is a clear sign of fatigue while driving. Yawning typically indicates that the body is signaling a need for rest or a decrease in alertness. When a driver experiences fatigue, their overall focus and attention to the road diminish, making it harder to react quickly to potential hazards. Recognizing signs of fatigue, such as frequent yawning, is crucial for maintaining safety on the road. It's important for drivers to be aware of their body's signals and to take breaks or rest when they notice such signs to prevent accidents that may result from impaired driving due to tiredness.