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 Alabama 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. To release a dolly's spring brakes before positioning the converter dolly for coupling, you should:

Explanation
If a converter dolly has spring brakes, you can release the brakes by using the dolly parking brake control. Releasing the dolly's brakes is the first step you should take when properly positioning the dolly in front of the rear trailer.

9. If you don't pull a dolly out from beneath the rear trailer before unlocking the pintle hook:

Explanation
Never unlock the pintle hook with the dolly still under the rear trailer. This could cause the dolly tow bar to fly up, possibly causing serious injury.

10. When in heavy traffic, the safest driving speed is:

Explanation
In heavy traffic, it is safest to travel at the same speed as other vehicles. If two vehicles continue to drive in the same direction at the same speed, they cannot hit each other.

11. Emergency equipment in a vehicle is:

Explanation
During a pre-trip inspection, you should check for emergency equipment, including spare electrical fuses; three red reflective triangles, six fuses, or three liquid burning flares; and at least one properly charged and rated fire extinguisher.

12. When pulled off on the side of the road:

Explanation
If you must stop on the side of the road, make sure to use your four-way emergency flashers. This is particularly important at night.

13. To release a dolly's air brakes before positioning the converter dolly for coupling, you should:

Explanation
If a converter dolly has air brakes, you can release the brakes by opening the dolly air tank petcock. Releasing the dolly's brakes is the first step you should take when properly positioning the dolly in front of the rear trailer.

14. Before positioning a converter dolly for coupling, you should release the dolly's spring brakes. Do this by:

Explanation
If a converter dolly has spring brakes, you can release the brakes by using the dolly parking brake control. Releasing the dolly's brakes is the first step you should take when positioning the dolly in front of the rear trailer.
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