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 Kentucky 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

1. When traveling on a downgrade, your vehicle will:

Explanation
Gravity causes a vehicle's speed to increase when traveling on a downgrade. Adjust your speed before reaching a downgrade.

2. When operating a set of doubles, the shut-off valves at the rear of the first trailer should be in their:

Explanation
When operating a double or triple, the shut-off valves at the rear of last trailer should be closed. All other shut-off valves should be open.

3. When conducting a check of the engine compartment during a vehicle inspection, you should not:

Explanation
When inspecting the engine compartment, you should check the oil level, coolant level, and windshield washer fluid level, among other things.

4. Black ice is:

Explanation
Black ice is a layer of ice that is thin and clear enough for the road to be visible through it. The surface will look like a wet road. Always be alert to black ice if the road looks wet when the temperature is below freezing.

5. When stopping, you should:

Explanation
When stopping, press down the brake pedal smoothly and gradually.

6. Hydroplaning:

Explanation
Hydroplaning is an effect in which a vehicle's tires lose traction with the surface of the road and instead glide along a layer of water. There does not have to be a large amount of water on the road for this to occur.

7. If a vehicle's Anti-Lock Braking System (ABS) is malfunctioning:

Explanation
An Anti-Lock Braking System (ABS) intervenes to reduce brake pressure if there is a risk of wheel lockup. If the ABS isn't working, the vehicle's basic braking functions are not affected. A driver should continue to drive and brake in a normal manner.
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