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 two, three or four possible answer choices. Test questions come from the Minnesota Commercial Driver’s Manual. Questions come from chapters covering: Driving Safely, Cargo, 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. If a load is 40 feet long, the minimum number of tie-downs required to secure the load is:

Explanation
On flatbed trailers and trailers without sides, cargo must be tied down. There should be at least one tie-down for every 10 feet of cargo. Regardless of the size of the cargo, at least two tie-downs must be used.

2. If feeling sleepy while driving, you should:

Explanation
If you begin to feel sleepy while driving, the only safe response is to stop driving and get some sleep. Attempting to fight off exhaustion is dangerous and a major cause of fatal crashes. Stimulants are not a safe solution because they may help keep you awake but will not make you more alert. Once stimulants wear off, you will be even more tired than you were originally.

3. To prevent fatigue while driving, you should:

Explanation
A hot, poorly-ventilated area can make a person sleepy. Opening a window, opening a vent, or using the air conditioning can help keep the cab cool and reduce the risk of fatigue.

4. When coupling a trailer:

Explanation
When coupling, make sure you couple matching glad hands. They are often color-coded to help drivers avoid mistakes. Typically, blue is used for service lines and red is used for emergency lines.

5. Rims with welding repairs:

Explanation
A driver should inspect wheels before a drive, specifically looking for damage on the wheels and rims. Wheels or rims that have had welding repairs are not safe for use.

6. Water that has collected on a roadway can cause:

Explanation
The risk of hydroplaning begins when water has collected on the surface of a road.

7. When inspecting cargo, the driver should ensure all of the following, except:

Explanation
When inspecting cargo, a driver must ensure that the cargo is balanced and properly secured. To reduce the risk of a rollover, the weight of a load of cargo should be kept as low as possible. A trailer should not be overloaded.
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