If another car is in danger of hitting you, you should:

  1. Sound your horn. ✓
  2. Wave your arms.
  3. Use your emergency lights.
  4. Flash your headlights.

Answer: A. Sound your horn.

You should sound your horn when another car is in danger of hitting you.

Why this is the answer

The Florida handbook covers a vehicle approaching in your lane and says to sound the horn and flash high beams, then steer to the side of the road. That makes the horn the warning action the bank answer selects. The passage does not say to wave your arms or use emergency lights for this. Because it also mentions high beams, the support for the horn by itself is not perfect.

Why the other answers are wrong

Remember it

When a car is coming at you, remember the horn as the warning to use, even though the handbook also mentions high beams.

Official handbook: Florida Driver License Handbook (FLHSMV), 10. Sharing The Road – Bicyclists, p. 80

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.