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 four possible answer choices. Test questions come from the New Jersey Commercial Driver Guide. 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. When merging into traffic while driving a double or triple, a driver should:

Explanation
Double and triple combinations require more space than smaller vehicles to enter or cross traffic. This is not only because the vehicle itself is larger, but also because it needs a longer distance to accelerate.

2. Areas of the road that are shaded:

Explanation
Because they are exposed to less sunlight, shaded patches of road will stay cooler longer than other areas of the road. Due to the lack of direct sunlight, shady areas can remain icy and slippery after ice on other areas of the road has melted.

3. When driving on packed snow, you should reduce your speed:

Explanation
When driving on packed snow, you should reduce your speed by one-half or more. It can be difficult to stop or turn when operating on a slippery surface, so you must adjust your speed to drive safely under such conditions.

4. If required to complete a vehicle inspection report in writing, the report must be signed:

Explanation
You must sign the previous vehicle inspection report only if defects were noted and certified to have been repaired or not needing to be repaired.

5. About how many drinks does it take for a 200-pound person to reach a 0.02 percent blood alcohol concentration (BAC)?

Explanation
Alcohol impairment begins long before the legal limit is reached. A 200-pound person will reach a blood alcohol concentration (BAC) of 0.02 percent after a single drink.

6. Which of the following is not a part of an air brake system?

Explanation
Air brakes consists of three separate braking systems: the service brake system, the parking brake system, and the emergency brake system.

7. What happens if the air pressure in a system's air tanks falls below 60 psi?

Explanation
In an air brake system, a low pressure warning signal should activate if the pressure in the air tanks falls to a level below 60 psi. This signal may be in the form of a warning light or a wig wag.
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