A person's ability to drive can be impaired by:

  1. Alcohol.
  2. Any medication.
  3. A lack of sleep.
  4. All of the above. ✓

Answer: D. All of the above.

All of the above: alcohol, medication, and lack of sleep can impair a person's ability to drive.

Why this is the answer

Florida's handbook treats impairment broadly. It says driving while impaired by drugs is illegal, and that many prescription and over-the-counter medicines can affect a person's ability to drive safely, so drivers should check labels. It also says drowsy driving is as dangerous as drunk driving and that fatigue slows reaction time and judgment. Elsewhere it states that anything affecting your physical or mental condition can impair driving. That is why alcohol, medication, and lack of sleep all belong in the answer.

Why the other answers are wrong

Remember it

Ask yourself whether something is changing your judgment, reaction time, or alertness; if so, it can affect your driving.

Official handbook: Florida Driver License Handbook (FLHSMV), 4. Before You Drive—You The Driver – Physical Health, p. 33

Explanation drafted with AI (deepseek-flash) from the official handbook passage cited above, then checked automatically and by a second model on 2026-10-23. Always confirm with the official handbook.