What is a danger signal of drowsy driving?

Not remembering driving the last few miles is a significant danger signal of drowsy driving. This phenomenon indicates that a driver's attention and cognitive function have diminished to such a level that they are not fully aware of their actions. When a driver cannot recall parts of their journey, it suggests that their brain is not adequately processing information, which can lead to serious safety risks.

Drowsiness impairs a driver's ability to stay focused, react to changing conditions on the road, and make sound decisions. Unawareness of one's driving actions is a critical warning sign that suggests immediate action is needed, such as pulling over to rest or switching drivers.

The other options might show fatigue or discomfort, but they do not reflect the same immediate and severe risk that comes with memory lapses in driving tasks.