When you use the vehicle’s horn for signaling:

1. The signal shall be given at a fast and unchanging pace.
2. You are lawfully required to honk at least three times.
3. Correct answer: The signal should not be longer than needed.
4. The signal shall be given in a long and continuous manner.

WhyUse the horn briefly and no more than needed. A long blast does not warn, it annoys.