Which of these is a sign that you should NOT drive?

Feeling sleepy is a significant indicator that you should not drive. Drowsy driving impairs your attention, reaction time, and decision-making abilities, much like driving under the influence of alcohol. When you are sleepy, your level of alertness decreases, making it difficult to stay focused on the road and respond to potential hazards.

It's crucial to recognize the signs of fatigue, such as yawning, difficulty focusing, or feeling heavy-eyed. Operating a vehicle in this state increases the risk of accidents, not only for you but for others on the road as well.

The other options—having a full stomach, listening to music, and talking to a passenger—do not directly impair your ability to drive in the same way that sleepiness does. While having a full stomach may occasionally cause discomfort, it does not significantly reduce alertness or awareness. Similarly, listening to music or engaging in conversation can be part of safe driving as long as they do not distract you from the task of driving itself.