Safely backing your vehicle requires all of the following, except:

  1. Looking over your right shoulder as you back up.
  2. Checking your vehicle's surroundings.
  3. Tapping your horn before you back up. ✓

Answer: C. Tapping your horn before you back up.

Tapping your horn before you back up is not part of safe backing — it is the one item on the list that the handbook does not require.

Why this is the answer

The handbook's backing procedure is built on looking and checking, not sounding the horn. It tells you to observe traffic and check the appropriate blind spots, then look in your rearview mirror and over your shoulder for approaching vehicles and pedestrians before you begin backing, and to stay aware of what is behind you as you back at a smooth, safe speed. The handbook gives the horn a different job: letting other drivers know you are there or warning them of a hazard, and it specifically says not to honk at a blind person.

Why the other answers are wrong

Remember it

Backing up is a looking skill: mirror, shoulder, blind spots, then roll back slowly. The horn is for warning others of a hazard, not for announcing a reverse.

Official handbook: California Driver Handbook (DL 600), Section 6: Navigating the Roads, p. 27

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.