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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 Jersey doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The NJ CDL doubles triples test covers the following sections of the New Jersey CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this NJ CDL practice test now to prepare for the actual test!
1. 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.
every registered motor vehicle must have at least one mirror.
you should check your after the start of any trip to make sure they are properly adjusted.
convex mirrors make things look larger and closer than they really are.
2. If your vehicle is hydroplaning, you should:
speed up.
stay off the brake.
put the vehicle in reverse.
apply the brakes.
3. If you doubt you have enough space to pass under a bridge, you should:
drive faster.
turn on your headlights.
go slowly.
turn on your 4-way emergency flashers.
4. Headache racks:
can blind other drivers.
protect you from being hit by your cargo.
help you keep weights within legal limits.
None of the above.
5. Right after it starts to rain, the road is very slippery. Why?
Because the water mixes with oil left on the road by vehicles.
Because black ice may form on the road.
Because rain is very slippery.
None of the above.
6. The trolley valve should be used only:
to prevent skids.
to test the trailer brakes.
in an emergency.
in driving.
7. If an aggressive driver confronts you, you should NOT:
make eye contact.
try to let them pass.
try to get out of their way.
ignore gestures.
8. The service line is also called:
control line.
power line.
brake line.
cable line.
9. Which of the following will NOT help you prevent rollover?
Using the controlled braking method.
Keeping the cargo as close to the ground as possible.
Driving slowly around turns.
All of the above.
10. Who is responsible for inspecting the cargo?
The shipper
The motor carrier
The person who loaded and secured the cargo
The driver
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NJ Doubles Triples Test

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