Car horns should be used

1. only as an suitable warning ✓
2. to let other drivers know that they are going too slowly
3. to show your anger
4. to make others give you room

Answer: A. only as an suitable warning

Car horns should be used only as a suitable warning — a useful signal to other drivers that helps prevent a crash.

Why this is the answer

The handbook treats the horn as a communication tool, not a way to express feelings or push other drivers. It says to use it only when it gives a useful signal and helps prevent a crash, such as a light tap when someone starts pulling out without looking. That matches using the horn as a warning. The passages do not support using it to criticize slow drivers, show anger, or demand space.

Why the other answers are wrong

• B. to let other drivers know that they are going too slowly — Using the horn because another driver is going too slowly is not a useful crash-prevention signal in the handbook; it is criticism, not warning.
• C. to show your anger — Showing anger with the horn is not a proper use; the handbook limits it to useful signals that help prevent a crash.
• D. to make others give you room — Honking to make others give you room is not described as a useful signal; the handbook says use the horn only when it helps prevent a crash.

Remember it

Think of the horn as a tap on the shoulder, not a megaphone: use it only to let someone know you are there when a crash is possible.