What is the best indicator of drowsy driving?

• A. Pull over to a safe location and rest or switch drivers
• B. Increase driving time to avoid stopping
• C. Frequent yawning, heavy eyelids, drifting between lanes, missing exits, and slow reaction times
• D. Turn up the radio

Answer: (C)

Drowsy driving shows up in real, observable signs that your body and brain aren’t keeping up with the road. When you notice frequent yawning, heavy eyelids, drifting between lanes, missing exits, and slow reaction times, those are direct clues that alertness has dropped and your driving ability is impaired. These symptoms reflect reduced attention, slower processing, and poorer control, which is why they’re the strongest indicator you’re too tired to drive safely. If you spot them, the safest move is to pull over to a safe location to rest or switch drivers.

The other options aren’t indicators of fatigue. Turning up the radio doesn’t reveal your level of alertness, it might only mask fatigue briefly. Increasing driving time to avoid stopping just compounds the problem by letting fatigue accumulate. Pulling over is the recommended action to take, not an indicator of drowsiness itself.