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 Missouri Commercial Driver’s 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. Rust around wheel nuts may mean:

Explanation
Rust around wheel nuts may mean that they are loose. Check the tightness of the nuts if you see any rust in the area.

2. In poor weather, many drivers:

Explanation
In bad weather, many automobile drivers will follow large trucks too closely, particularly if visibility is poor.

3. Traction is important in:

Explanation
You will not be able to brake or steer your vehicle without adequate traction. Ensure that your tires are in proper working condition before beginning a trip.

4. When you are pulling a trailer, the air supply control lever should be in its ____ position.

Explanation
Tractor protection controls in older vehicles may be operated by levers instead of knobs. If an air supply control is set in its "normal" position, it is properly set for you to pull a trailer.

5. When should you slow for a curve?

Explanation
You should always slow to a safe speed before entering a curve. Slowing while within the curve could cause a skid.

6. Mirrors should be used:

Explanation
When driving, you should frequently check the mirrors on both sides of your vehicle.

7. The more alcohol in the body:

Explanation
The body removes alcohol at a fixed rate. The more alcohol consumed, the longer it will take for the body to remove the alcohol from its system.
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