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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. With brake drums, if brakes become too hot:
the air compressor will kick on to cool the brakes.
the brakes will supply too much power to the drive wheels.
your ABS will malfunction.
The brakes may stop working
2. During a walk around inspection of a double or triple trailer, make sure that the converter dolly air tank drain valve is _____ and the glad hands are ______.
open; not connected
closed; properly connected
open; properly connected
closed; not connected
3. The tractor protection valve:
keeps air from going out if the air compressor develops a leak.
keeps your wheels from locking up when you brake hard.
keeps air in the brake system should the trailer develop a bad leak.
prevents the trailer from being accidentally released.
4. Which of the following is not a braking system on a truck?
Parking brake
Service brake
Steering brake
Emergency brake
5. If you have to drive off the road, you should:
keep one set of wheels on the pavement, if possible.
leave the road completely.
fully apply the brakes until your speed has dropped to about 20 mph.
brake as hard as you can to maintain control.
6. The space under a heavily loaded vehicle can be very small. This can cause problems:
on dirt roads.
when crossing railroad tracks.
on unpaved yards.
All of the above.
7. Air tank drains:
are used to move air to the brakes.
should not be used in wet weather.
protect the tanks and the rest of the system from too much pressure.
are used to remove water and oil from the air tanks.
8. If a load is 50 feet long, the minimum number of tie-downs required is:
9. Retarders:
apply their braking power whenever you push on the accelerator.
help slow a vehicle and reduce brake wear.
help prevent accidents by applying extra braking power to the non-drive wheels.
All of the above.
10. Who is responsible for inspecting the cargo?
The motor carrier
The driver
The shipper
The person who loaded and secured the cargo
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NY CDL Doubles Triples Test

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