Before using a helper while backing, which hand signal is most important for both people to understand?
Correct answer: D – Stop
The driver and helper should agree on a clear stop signal before backing begins. The helper should remain near the rear of the vehicle in a position where the driver can see them. If visual contact with the helper is lost, the driver should stop rather than continue the maneuver without guidance.
Source: Michigan Commercial Driver License Manual — § 2.2.4, “Backing safely” — “Use a helper”


