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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The North Carolina doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The NC CDL doubles triples test covers the following sections of the North Carolina CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this NC CDL practice test now to prepare for the actual test!
1. When driving with more than one trailer, the _______ trailer should be the first one behind the tractor.
2. Over-length loads:
require special driving care.
require special transit permits.
may require special equipment such as "wide load" or flags.
All of the above.
3. If the safety relief valve in the air brake system releases air:
the valve is fully operational.
something is wrong.
this will supply more power to the brakes.
this will supply more power to the drive wheels.
4. When driving double and triple trailers, drivers should:
look far ahead.
steer gently and go slowly around corners.
allow more following distance.
All of the above.
5. The posted speed limit for a curve:
is safe for trucks or buses, but it may be too fast for cars.
is optional and may be exceeded.
may be too fast for many trucks or buses.
is safe for all vehicles.
6. If you must drive slowly, how should you alert following drivers?
Help them out by signaling when it is safe to pass
Flash your brake lights
Use your emergency flashers if it is legal
Turn on your taillights
7. When approaching a double railroad track, you should:
remember that trains may be more frequent.
rely upon the presence of warning signals.
expect to hear a train when it's approaching.
remember that a train on one track may hide a train on the other track.
8. What is Gross Vehicle Weight?
The total weight of a single vehicle, including its load
The total weight of a single vehicle, excluding its load
The total weight of a combination of vehicles excluding the load
The total weight of the cargo
9. When driving, you should check mirrors regularly to know where other vehicles are around you. Remember that:
there are blind spots that your mirrors cannot show you.
convex mirrors make things look larger and closer than they really are.
you should check your after the start of any trip to make sure they are properly adjusted.
every registered motor vehicle must have at least one mirror.
10. If your ABS malfunctions:
you still have normal brake functions.
the parking brakes will not work.
you should immediately come to a complete stop.
the service brake will not work.
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NC CDL Doubles Triples Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Number of questions: 20
Correct answers to pass:16
Passing score:80%
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