Instructions

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 20

Passing Score 16

1. Doubles and triples:

Can swerve more easily than most other vehicles.

Should be driven 20 mph slower than posted speed limits.

Require the driver to identify hazards well in advance.

Should not be driven in the rain.

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:

Prevent cargo from shifting.

Prevent skidding.

Keep doors closed during transit.

Label radioactive materials.

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:

Drive on the shoulder.

Pull off the roadway.

Drive faster.

Allow the vehicle to pass.

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:

May be used on any part of a bus.

May be used on the front of a bus.

May be used on the rear of a bus.

May never be used on a bus.

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

5. To help prevent rollovers, you should:

Accelerate quickly after stopping.

Drive slowly around turns.

Keep the load near the back of the trailer.

Keep the load on one side of the trailer.

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:

The driver will not know.

A yellow lamp will light up on the control panel.

The brakes will lock up.

The brakes will not work.

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:

Braking will only occur if there is enough air in the tanks.

You can brake 14 times before the air in the system runs out.

You should continue to drive normally and check the brake system when it is convenient.

You should continue driving, but turn the emergency flashers on to warn other motorists.

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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