CDL · Doubles and triples
You are pulling doubles and must make a sudden turn. Which trailer has the greatest chance of turning over?
Correct answer: The rear trailer, which has double the tractor's risk of rolling over.
Answer options
- AThe rear trailer, which has double the tractor's risk of rolling over Correct
- BBoth trailers equally, since their risk of rolling over is the same
- CThe front trailer, which has double the tractor's risk of rolling over
Why
Because of rearward amplification, often called the crack-the-whip effect, a sudden steering input grows larger at each trailer, so the last one swings farthest and is the most prone to rolling over. In a set of doubles, the rear trailer has twice the tractor's chance of tipping over.
About this question
Topic: Doubles and triples License: CDL
Part of these practice sets:
Where it applies: Asked in every state.
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This question is part of Driving a Tractor-Trailer (14 questions). Take the full set and check your score.
Practice Driving a Tractor-TrailerMore questions from Driving a Tractor-Trailer
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- You are pulling a tank trailer when the tractor's drive wheels lock up. What could happen?
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- What should you do when the wheels of your trailer begin to skid?
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