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 or four possible answer choices. Test questions come from the State of Delaware 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. If you don't pull the dolly out from beneath the rear trailer before unlocking the pintle hook:

Explanation
Never unlock the pintle hook with the dolly still under the rear trailer. This could cause the dolly tow bar to fly up, possibly causing serious injury.

2. To ensure that you do not slow down traffic when driving a large truck, you should:

Explanation
If a heavy load prevents your vehicle from keeping up with the speed of other traffic, you should stay in the right lane.

3. When driving through fog, a driver should:

Explanation
If you must drive in fog, you should use your low beam headlights.

4. When driving, it is important that you:

Explanation
When driving, you should continually scan the road for possible hazards. Form plans about what you will do if the hazards develop into emergencies.

5. Hydraulic brakes can fail for one of two reasons. Which of the following is one of those reasons?

Explanation
Most hydraulic brake failures occur for one of two reasons. A first likely cause of brake failure is that the brakes have been overused on a downgrade, causing them to fade. The second likely cause is that there has been a loss of hydraulic pressure in the braking system. Brakes kept in good condition will rarely fail, but you should know which steps to take in case they do.

6. Maintaining a cushion of space between your vehicle and the vehicle ahead is:

Explanation
For safe driving, it is essential that you maintain cushions of space on all sides of your vehicle. This helps to ensure that you will have time to take appropriate action if a problem arises.

7. Rollovers happen when drivers:

Explanation
A rollover happens as a result of a driver taking a turn at too high a speed. Be sure to take turns and curves safely and slowly.
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