CDL · Doubles and triples
You are getting ready to hook a second trailer to your rig. What can you use to hold that trailer in place?
Correct answer: Its own spring or emergency brakes, or wheel chocks, whichever is available.
Answer options
- AIts own spring or emergency brakes, or wheel chocks, whichever is available. Correct
- BIts own brakes only, because wheel chocks are not allowed.
- CWheel chocks only, because the trailer's own brakes cannot be trusted.
Why
A second trailer can be held still either by its own spring or emergency brakes or by chocks placed at its wheels, so you may use whichever of these you have. If you have any doubt about the trailer's brakes, chock the wheels as well.
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
- Which of these steps do you carry out first when uncoupling standard doubles?
- When you uncouple twin trailers, which of these is the final step?
- Which statement about a converter dolly is true?
- When you drop the rear trailer from a double combination, what should you do with the air shut-off valve at the back of the front trailer?
- You are about to uncouple the rear trailer. What do you do first?
- In the official CDL manual, the section on doubles and triples generally explains coupling and uncoupling for which combinations?
- When hooking a converter dolly to the second or third trailer, how can you tell that the trailer is at the right height?
- Compared with an A-dolly, what is the main thing a B-dolly or C-dolly adds?
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