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 possible answer choices. Test questions come from the Maine 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. Pre-trip inspections are:

Explanation
Federal and state laws require drivers to inspect their vehicles before every trip, regardless of length.

9. To avoid a hazard:

Explanation
In some emergencies, the best strategy for avoiding a hazard may be to drive onto the shoulder. Most shoulders are strong enough to support the weight of a large vehicle.

10. When parking, you should:

Explanation
Backing is always dangerous and should be avoided whenever possible. When parking, you should seek a space that allows you to pull forward when exiting. Try not to park near smaller vehicles to help you avoid maneuvering issues.

11. If driving through flowing water or a large puddle, you should:

Explanation
It is best to avoid driving through large puddles or moving water. If there is no way to avoid driving through water, you should slow down, shift into a low gear, and gently apply the brakes. Pressing linings against the brake drums or discs will keep water, mud, silt, and sand from getting inside the brake mechanisms.

12. The heavier the vehicle:

Explanation
The heavier a vehicle is, the more the brakes will need to work to bring the vehicle to a complete stop.

13. Before a trip, ensure that the air lines are not:

Explanation
When inspecting the convertor dolly, ensure that all components are present and in proper working condition. Be sure to check the upper and lower fifth wheel, the air lines, and the electric lines. The air lines should be securely attached to the proper glad hands and should not contain any leaks. They should be attached with enough slack to allow easy turning.

14. Braking mechanisms are located inside:

Explanation
Drum brakes are attached to the wheels and located on the axles of a vehicle. The braking mechanisms that cause the vehicle to stop can be found inside of a drum brake.
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