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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. Which of the following road surfaces freezes first?
Open roads
2. Hanging meat in a refrigerated truck can be:
a very unstable load with a low center of gravity.
a very stable load if properly distributed.
a very stable load with a low center of gravity.
a very unstable load with a high center of gravity.
3. On dry pavement, the braking distance when travelling at 55 mph is about:
216 feet.
419 feet.
61 feet.
142 feet.
4. Doubles and triples:
can be turned suddently due to the low center of gravity.
have a lower chance of skidding.
can't be turned suddenly.
can be stopped suddenly due to their weight.
5. To prevent rollover, you should:
place the cargo near the front of the trailer.
keep the cargo as close to the ground as possible.
put the lightest parts of the cargo under the heaviest parts.
place the cargo near the rear of the trailer.
6. When the wheels of a trailer lock up, which of the following is most likely to occur?
The rig will stay in a straight line but slide sideways.
The trailer will the trailer has overturn.
The trailer will tend to swing around (trailer jackknife).
The trailer will tend to push the towing vehicle sideways (tractor jackknife).
7. 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
8. ABS:
improves your visibility at night.
may cause your wheels to lock when you break hard.
helps you stop faster.
helps you avoid skids caused by over braking.
9. You are driving on a steep downgrade in the proper low gear. Your "safe" speed is 40 mph. When your speed reaches 40 mph, you should:
increase your speed to approximately 45 mph, and then apply release the brakes.
apply the brakes to gradually reduce your speed to 35 mph, and then release the brakes.
maintain your current speed, and apply the brakes when you reach 50 mph to gradually reduce your speed to 40 mph.
apply the brakes to quickly reduce your speed to 25 mph, and then release the brakes.
10. After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
20 miles
two hours
25 miles
50 miles
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NJ Doubles Triples CDL Test

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