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 North Dakota Commercial Driver Guide. Questions come from chapters covering: Driving Safely, Transporting Cargo 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. Doubles and triples:

Explanation
To avoid rolling over and jackknifing, doubles and triples must be driven smoothly. To allow this, drivers should look well ahead of their vehicles so they can spot hazards early and have as much time as possible to make the necessary maneuvers.

2. Tie-downs are used to:

Explanation
On flatbed trailers and trailers without sides, cargo must be tied down to prevent it from shifting or falling in transit. There should be at least one tie-down for every 10 feet of cargo. Regardless of the size of the cargo, at least two tie-downs must be used.

3. If you are being tailgated, you should:

Explanation
If you are being tailgated, it is best to allow more room to open up in front of your vehicle. This will help you avoid the need for sudden stops, which could result in the tailgater rear-ending you, and will make it easier for the tailgater to pass. Speeding up may only make things more dangerous by prompting the other driver to continue tailgating you at a higher speed.

4. Retreaded tires:

Explanation
Regrooved, recapped, or retreaded tires are prohibited from use on the front wheels of a bus.

5. To help prevent rollovers, you should:

Explanation
To lower the risk of a rollover, load your cargo as closely to the ground as possible. To further reduce this risk, take curves and corners slowly.

6. If an Anti-Lock Braking System (ABS) malfunctions:

Explanation
On a vehicle with ABS, a yellow malfunction lamp on the instrument panel will illuminate to alert you if the braking system is not working.

7. If the low pressure warning light comes on while you are driving:

Explanation
If the low air pressure warning light turns on, you should stop and safely park your vehicle as soon as possible. Controlled braking will be possible only as long as enough air remains in the tanks.
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