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 Idaho Commercial Driver’s License Manual. Questions come from chapters covering: Driving Safely, Transporting 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. A cracked rim should be:

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.

2. If there is a cargo fire in a box trailer:

Explanation
The doors of a trailer should be not be opened in the event of a cargo fire, especially if the cargo includes hazardous materials. Opening trailer doors would increase the fire's oxygen supply, potentially causing the fire to increase in size.

3. If you are feeling tired and yawning a lot while you are driving, you should:

Explanation
If you begin to feel tired while driving, you should stop to get some sleep. Trying to push on to reach your destination while tired is dangerous. You should not rely on caffeine to keep you awake.

4. When trying to put out an electrical fire, you should:

Explanation
B:C fire extinguishers are designed to work on electrical fires and burning liquids. Don't pour water on an electrical fire.

5. Anti-Lock Braking Systems (ABS):

Explanation
An Anti-Lock Braking System (ABS) helps prevent wheels from locking up during a hard application of brakes.

6. Always perform the steps of a pre-trip inspection in the same order each time because:

Explanation
Completing the steps of a vehicle inspection in the same order before every trip aids in learning what the proper steps are. Additionally, you be less likely to forget a step when going through the checklist in a prescribed order.

7. To help prevent a rollover, cargo should be:

Explanation
If a vehicle is top-heavy, it is more likely to roll over. The weight of cargo should be positioned as low in a trailer as possible to minimize this risk.
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