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 three or four possible answer choices. Test questions come from the Nevada 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

8. If the brakes “pull” to one side or the other when you use them, it's a sign that:

Explanation
If your vehicle "pulls" to one side when braking, you may have brake trouble. If there is an issue with your brakes, you should fix the issue before driving. Operating an unsafe vehicle is against federal and state laws.

9. To use the controlled braking method, you should:

Explanation
The method of controlled braking involves applying the brakes as hard as you can without locking the wheels. If you need to make large steering adjustments while using controlled braking, you should remove your foot from the brake pedal, steer, then reapply the brakes.

10. Vehicles with low underneath clearance may be difficult to drive:

Explanation
Railroad-highway crossings may be difficult to cross when pulling a trailer with a low underneath clearance. In particular, both low-slung units and single-axle tractors pulling long trailers are especially challenging to drive over raised crossings.

11. On low bridges:

Explanation
Height warnings are often, but not always, posted on low bridges. If you are unsure if you will be able to clear an overhead object, go slowly.

12. The minimum size of placards identifying hazardous materials is:

Explanation
Hazardous materials placards must be at least 10 and three-quarter inches square.

13. Brake fading is caused when:

Explanation
Using the brakes excessively will cause them to overheat, making them less effective. This is referred to as "fading."

14. If you are unsure if there is enough space for your vehicle to safely pass under an upcoming bridge, you should:

Explanation
If you are not confident that your vehicle will have enough room to safely pass under an overhead object, you should slow down and seek another route, if possible.
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