CDL · Doubles and triples

If a set of doubles includes only a single 28.5-foot pup trailer, what is that configuration called?

Correct answer: A Rocky Mountain double.

Answer options

  1. AA turnpike double
  2. BA Rocky Mountain double Correct
  3. CA standard (STAA) double

Why

Of these three setups, only the Rocky Mountain double mixes trailer lengths, pairing a long lead semitrailer with one 28.5-foot pup. A standard STAA double uses two short pups, and a turnpike double uses two long trailers.

About this question

Topic: Doubles and triples   License: CDL

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Where it applies: Asked in every state.

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