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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 Nebraska doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The NE CDL doubles triples test covers the following sections of the Nebraska CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this NE CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Nebraska.
1. Headache racks:
can blind other drivers.
help you keep weights within legal limits.
protect you from being hit by your cargo.
None of the above.
2. Most heavy-duty vehicles use:
hydraulic brakes.
pressure brakes.
air brakes.
solid brakes.
3. Glad hands are:
warning devices.
securement devices.
coupling devices.
electronic devices.
4. During freezing weather, which area is most likely to be slippery after it rains?
Shaded areas.
Roads that look wet.
All of the above.
5. What is the minimum tread depth for tires other than front tires?
4/16 inch
8/32 inch
2/32 inch
4/32 inch
6. If your trucks has a high center of gravity, which of the following is true for curves?
You should slow down, as your truck can roll over at the posted speed limit for the curve.
Reduce your speed to a crawl.
You should travel at the posted speed limit.
None of the above.
7. ABS helps you:
keep the wheels from locking up.
decrease your overall stopping distance.
decrease your average speed.
lock your wheels.
8. Which of the following is a common cause of truck fires?
loose fuel connections.
Short circuits due to loose connections.
Under-inflated tires and duals that touch.
All of the above.
9. Before driving a vehicle with a dual brake brake system, the driver should:
wait at least 5 minutes before driving.
allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
wait at least 10 minutes before driving.
pump the brake pedal 10 times to build pressure.
10. When driving a double or triple, you should:
drive in the left lane whenever possible.
decrease your following distance.
increase your following distance.
drive with emergency flashers on.
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NE CDL Doubles Triples Test

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