What can impair a person's ability to drive safely?

The ability to drive safely can be significantly impaired by various factors, particularly fatigue and medication, both of which can affect a driver's cognitive functions and physical capabilities.

Fatigue can diminish a person's attention, reaction time, and decision-making skills, leading to a higher risk of accidents. When someone is tired, they may struggle to maintain focus on the road, misjudge distances, or even fall asleep while driving, all of which can have serious consequences.

On the other hand, certain medications can have side effects that impact driving abilities. These can include drowsiness, blurred vision, reduced coordination, and impaired judgment. Both prescription and over-the-counter medications can have such effects, and it's crucial for drivers to be aware of how their medications might influence their ability to operate a vehicle safely.

Therefore, both fatigue and medication can seriously diminish a person's capacity to drive safely, making the option that includes both the correct choice.