Before starting to back your vehicle, you should do which of the following?

  1. Open the windows
  2. Sound your horn
  3. Activate four-way flashers
  4. All of the above ✓

Answer: D. All of the above

Before backing, you should open the windows, sound your horn and activate your four-way flashers, so the choice listing all of these is correct.

Why this is the answer

The Backing passage says that before reversing you should turn off your phone or radio, open the windows, turn on the four-way flashers and sound the horn. It then tells you to get out and check the area behind the truck. Since the handbook groups opening the windows, sounding the horn and activating the flashers together as pre-backing steps, the choice that includes all three matches the handbook.

Why the other answers are wrong

Remember it

Build a pre-back routine: prepare the cab, warn others, then look behind.

Official handbook: Official MTO Truck Handbook, Backing

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.