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CDL · Danger Zones and Mirrors

Why is backing a school bus discouraged, and what must the driver do if backing is unavoidable?

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

Backing is dangerous because of the large blind area behind the bus where children may be; if it cannot be avoided, the driver should use a responsible adult or aide as a lookout and back slowly while checking mirrors

  1. A Backing is encouraged to save time
  2. B The driver should back quickly to finish fast
  3. C Backing is dangerous because of the large blind area behind the bus where children may be; if it cannot be avoided, the driver should use a responsible adult or aide as a lookout and back slowly while checking mirrors
  4. D Backing is perfectly safe at any speed

Why this is the answer

Backing a school bus is strongly discouraged because the area directly behind the bus is a large blind spot where a child could be standing unseen. Routes are planned to avoid the need to back whenever possible. If backing truly cannot be avoided, the driver should use a posted lookout — such as an aide or responsible adult — to watch the rear, sound the horn to warn anyone nearby, check all mirrors continuously, and back very slowly, stopping immediately if there is any doubt. The safest practice is to plan turnarounds that eliminate backing where students may be present.
Source: FMCSA CDL Manual 10.1.4 Avoiding Backing

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About this topic: Danger Zones and Mirrors

The danger zone is the area within ten feet around a school bus where students are most at risk, and mirrors are set up to see every part of it. These questions cover mirror adjustment, blind spots and what to check before moving. This is one of 13 School Bus questions on danger zones and mirrors, each with a full explanation on a single study page.

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