Practice question

FMVSS 131 governs the school bus stop signal arm. What does the standard primarily specify?

  1. The interior headliner flammability rating
  2. The maximum engine horsepower of a school bus
  3. The size, retroreflective/lamp markings, and operation of the stop arm
  4. The seat-back padding thickness

Answer: C — The size, retroreflective/lamp markings, and operation of the stop arm

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