CDL · Doubles and triples
You are about to uncouple the rear trailer. What do you do first?
Correct answer: Stop the rig on solid, flat ground with all units lined up straight.
Answer options
- AStop the rig on solid, flat ground with all units lined up straight. Correct
- BStop the rig on a slope with the units at a 45-degree angle.
- CStop the rig on flat ground with the units at a 45-degree angle.
Why
Uncoupling starts with stopping the whole rig on firm, level ground with every unit lined up straight, then setting the parking brakes so nothing can move. A straight, level position keeps the units aligned so the dolly can later be pulled straight out from under the trailer.
About this question
Topic: Doubles and triples License: CDL
Part of these practice sets:
Where it applies: Asked in every state.
Practice the whole set
This question is part of Coupling Doubles and Converter Dollies (28 questions). Take the full set and check your score.
Practice Coupling Doubles and Converter DolliesMore questions from Coupling Doubles and Converter Dollies
- When hooking a converter dolly to the second or third trailer, how can you tell that the trailer is at the right height?
- Which statement about a converter dolly is true?
- Which description best fits a converter dolly?
- Which of these steps do you carry out first when uncoupling standard doubles?
- You are unhooking the second semitrailer of a double. To what point do you crank down its landing gear?
- You are getting ready to hook a second trailer to your rig. What can you use to hold that trailer in place?
- You are about to hook up a second trailer that has no spring brakes. How can you hold it in place first?
- When you uncouple twin trailers, which of these is the final step?
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