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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 New York doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The NY CDL doubles triples test covers the following sections of the New York CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this NY CDL practice test now to prepare for the actual test!
1. If your vehicle thumps or vibrates heavily, it may be a sign that:
the engine belt is loose.
the brakes have failed.
one of the tires has gone flat.
you need to shift up.
2. Dollies with ABS are required to have a malfunction lamp:
on the rear.
on the left side.
on the front.
on the right side.
3. Which of the following is most likely to roll over?
The middle trailer of a triple
The front trailer of a double
The rear trailer of a double
The rear trailer of a triple
4. If an aggressive driver is involved in an accident down the road, you should:
make eye contact with the driver.
try to get their vehicle to the side of the road.
stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
confront the aggressive driver.
5. Placards must be at least _____ inches square.
6. Which of the following statements is true?
Poor cargo ventilation is a common cause of fire.
Under-inflated tires will NOT cause a vehicle fire.
Carrying a properly charged and rated fire extinguisher will help prevent fires.
There is no way that short circuits due to damaged insulation can cause a vehicle fire.
7. Rollovers happen when drivers:
stop too often.
turn too slowly.
brake too hard.
turn too fast.
8. If you cannot make a right turn without entering another traffic lane, you should:
swing wide to the left before starting the turn.
turn wide as you complete the turn.
turn wide before you start the turn.
watch out for vehicles coming toward you and back up for them.
9. By pushing the trailer air supply control knob in, you:
shut the air off and put on the trailer emergency brakes.
keeps air in the tractor or truck brake system.
supply the trailer with air.
supply the tires with air.
10. Most heavy trucks with manual transmissions require ____ to change gears.
triple clutching
double clutching
single clutching
None of the above.
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NY Doubles Triples Test

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