A tractor pulling doubles cannot brake as quickly as a tractor pulling a single trailer because:
Correct. Greater weight and longer air lines mean longer braking distance. Plan stopping distance with extra margin.
CDL Practice Question #360
Category: Doubles/Triples
Why this question matters
This question is one of 50 in our Doubles/Triples bank. The reasoning above comes directly from the AAMVA CDL Manual, the source document used by every U.S. state DMV. Memorizing the underlying rule — not just the letter answer — is what separates passing on the first attempt from a return trip and another fee.