Double

This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice.. Read More

This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. To pass, the applicant must answer at least 16 questions correctly. Each question has two, three or four possible answer choices. Test questions come from the Nebraska Commercial Driver License Manual. Questions come from chapters covering: Driving Safely, Air Brakes (if applicable), Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.

Number of Question
Passing Score

1. Before positioning a converter dolly for coupling, you should release the dolly's air brakes. Do this by:

Explanation
If a converter dolly has air brakes, you can release the brakes by opening the dolly air tank petcock. Releasing the dolly's brakes is the first step you should take when positioning the dolly in front of the rear trailer.

2. When driving, it is important that you:

Explanation
When driving, you should continually scan the road for possible hazards. Form plans about what you will do if the hazards develop into emergencies.

3. When should you watch out for black ice?

Explanation
Black ice is a thin layer of ice that is clear enough for the road surface to be seen through it. Be alert to black ice any time the temperature is below freezing and the road surface looks wet.

4. While uncoupling, the landing gear should be:

Explanation
Landing gear, or trailer supports, should always be completely raised before a vehicle is driven. When uncoupling, landing gear should be lowered to make firm contact with the ground. If a trailer is loaded when it is being uncoupled, you should lower the landing gear and turn the crank a few additional times to remove some weight from the trailer.

5. When traveling down a downgrade, the speed of a vehicle will likely:

Explanation
The force of gravity will cause a vehicle's speed to increase when traveling downhill.

6. When driving a trailer with ABS, you should:

Explanation
When driving a tractor-trailer combination equipped with an Anti-Lock Braking System (ABS), you should brake in the same manner that you would if operating a vehicle without ABS.

7. Brake fade is a result of:

Explanation
If brakes are used too much, they will overheat and become less effective. This is referred to as brake fade.
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