What can impair fitness to drive?

You answered correctly. Fatigue, alcohol and other intoxicants, and certain medicines can all impair your ability to drive safely. Fatigue reduces your attention and reaction time. Alcohol and drugs can slow your reflexes, impair judgment, and affect coordination. Some medications may cause drowsiness or other side effects that impact your driving ability, even if they are legally prescribed. Always consider your physical and mental condition before driving to ensure you are fit to operate a vehicle safely.