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CDL · Basic Vehicle Control

When backing a commercial vehicle, what is the safest method?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

Use a helper when possible and back slowly

  1. A Rely on your mirrors only and never use a helper
  2. B Back quickly to minimize the time spent in reverse
  3. C Use a helper when possible and back slowly
  4. D Always back in a straight line regardless of where you need to go

Why this is the answer

Backing a commercial vehicle is dangerous because you cannot see everything behind the trailer. The safest approach is to use a helper whenever possible and to back slowly. A helper should stand near the back of the vehicle in a position where the driver can see them in the side mirror, and driver and helper should agree on hand signals before backing begins, including a clear signal to stop. The driver should back slowly so any developing problem can be corrected with minimal damage. Quick backing reduces reaction time and increases jackknife risk. Mirrors alone are insufficient because of large blind spots directly behind a tractor-trailer. Backing in a straight line is preferred where possible because turning while reversing rapidly increases the chance of jackknifing.
Source: FMCSA CDL Manual 2.2.4 Backing Safely

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About this topic: Basic Vehicle Control

Basic vehicle control is the foundation: starting, stopping, turning, backing, and judging where the trailer is at every moment. Off-tracking and trailer swing are the biggest sources of city-driving incidents for new CDL holders. This is one of 6 General Knowledge questions on basic vehicle control, each with a full explanation on a single study page.

New to this exam? Our CDL exam guide explains the format, scoring, and how to prepare.

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