Instructions

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 20

Passing Score 16

1. A distracted driver:

Usually follows the rules of the road.

Usually has slowed perception.

Is a good person to follow.

Distracted drivers perceive hazards on the road more slowly than drivers who are focused, or they do not perceive hazards at all.

2. Parked delivery trucks may be hazardous because:

The trucks are often shiny.

People are often in a hurry when exiting such trucks and may not look for other vehicles.

Packages often fall out of the trucks and into the road.

Passing parked delivery or postal trucks can be dangerous because the driver may be in a hurry and pull into traffic without warning, or may they suddenly step out of the vehicle without checking for other traffic.

3. If trying to correct a drive-wheel braking skid, the driver should:

Accelerate.

Countersteer.

Engage the emergency brake.

To correct a drive-wheel braking skid, you should first remove pressure from the brake pedal to allow the locked wheels to begin rolling again. Quickly steer in the direction you want to go, then countersteer to prevent your vehicle from skidding in the opposite direction.

4. Rust around wheel nuts may mean:

The nuts are too tight.

The nuts are loose.

The tires should be replaced.

Rust around wheel nuts can indicate that the nuts are loose. If you find rust near the wheel nuts, check their tightness before beginning to drive.

5. When driving at night, you should do all of the following, except:

Make sure you are rested.

Make sure your glasses are clean.

Wear sunglasses.

To ensure that you can see as well as possible, don't wear sunglasses when driving at night. If you wear eyeglasses, make sure they are clean and unscratched. Make sure you are rested and alert before driving at night.

6. How do ice cream trucks become hazardous to other drivers?

Ice cream trucks must be kept cold.

Children often run toward an ice cream truck without looking for other traffic.

Ice cream trucks leave trails of water and ice on the roadway.

Ice cream trucks can create hazardous conditions for other drivers because they attract children. Children often do not notice or pay attention to other vehicles on the roadway when running to or from ice cream trucks.

7. A truck tractor built after March 1, 1997 must be equipped with:

An Anti-Lock Braking System (ABS).

A flag.

Hydraulic brakes.

Truck tractors with air brakes built on or after March 1, 1997 are required to be equipped with Anti-Lock Braking Systems (ABS).

Grade This Section