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 Hampshire CDL Driver’s 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. In a dual air brake system:

Explanation
Most heavy-duty vehicles use dual air brake systems. A dual air brake system consists of two separate air brake systems, connected by a single set of brake controls. Each system has its own air tanks.

2. Wheel rims that have been welded should:

Explanation
Wheels and rims with welding repairs are not safe to be used. Replace any damaged wheels and rims.

3. When entering traffic, a large vehicle usually needs:

Explanation
A large vehicle requires more space when entering or crossing traffic than a smaller vehicle. This is not only because the vehicle itself is larger, but also because it needs a longer distance to accelerate.

4. 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.

5. To prevent a set of doubles or triples from rolling over, you should:

Explanation
To avoid rolling over, you should drive slowly and steer gently when turning, taking curves, and driving around corners. Remember that a safe speed for a straight truck or single trailer combination may be too fast for a double or triple trailer combination.

6. When connecting a converter dolly to a second or third trailer, the trailer height should be:

Explanation
When connecting a converter dolly to a second or third trailer, the trailer height should be correct. It should be slightly lower than the center of the fifth wheel.

7. On any upgrade, gravity will:

Explanation
When driving uphill, you are fighting the force of gravity, which will slow down your vehicle.
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