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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. To reduce driver distraction, you should do all of the following except:
Pre-program radio stations
Plan your route before driving
Eat while driving.
Adjust mirrors before driving
2. In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. If you wish to change lanes, you should:
assume the car left the roadway and change lanes as normal.
wait until you are sure the car isn't in your blind spot.
ease into the other lane slowly so the other car can get out of the way.
None of the above.
3. If the fifth-wheel locking lever is not locked after the jaws close around the kingpin:
cargo is properly blocked.
the parking brakes are on and the wheels are chocked.
the coupling is not right and you should not drive until you get it fixed.
the parking brakes are on and your vehicle is safe to drive.
4. How does ABS help you?
ABS helps you avoid wheel lock up and maintain control when you brake hard on slippery surfaces.
ABS makes stab braking more effective.
ABS always shortens your stopping distance.
ABS replaces your normal brakes and helps you  to stop faster.
5. Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
2/8 inch
8/32 inch
4/32 inch
6/24 inch
6. The last trailer of triples is ______ as likely to turn over as a five-axle tractor.
4 times
5 times
3.5 times
7. On front tires, tread should be at least:
1/16 inch
4/32 inch
2/32 inch
4/16 inch
8. Which of the following is most likely to get stuck on raised railroad crossings?
A single-axle tractor with no trailer
An empty truck
A single-axle tractor pulling a small trailer
A low slung unit
9. Empty trucks:
require the same stopping distance than full trucks.
require a greater stopping distance than full trucks.
require a shorter stopping distance than full trucks.
None of the above.
10. Which of these describes the proper braking technique when driving on a long and steep downgrade?
Apply the brakes. When your speed has been reduced to 5 mph below your safe speed, release the brakes. When your speed has increased to your safe speed, repeat the previous steps.
Apply the brakes until your speed has been reduced to 5 mph, then release the brakes. When your speed has increased to your safe speed, repeat the previous steps.
Release the brakes until your speed is 5 mph above your safe speed, then apply the brakes. When your speed has decreased to your safe speed, repeat the previous steps.
All of the above.
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NJ CDL Doubles Triples Test

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