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 or four possible answer choices. Test questions come from the North Carolina 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 20

Passing Score 16

1. Belts in the engine compartment should be:

Frayed.

Tight.

Greasy.

Easy to slide off.

When inspecting your vehicle's engine, check the belts for tightness and excessive wear. The amount of "give" that is safe for each belt in a given engine will vary, so learn what is appropriate for your vehicle.

2. Low underneath clearance can cause difficulties when driving:

Over railroad crossings.

On gravel roads.

Around corners.

At the posted speed limit.

Railroad-highway crossings may be difficult to cross if you are pulling a trailer with low underneath clearance. In particular, both low-slung units and single-axle tractors pulling long trailers are especially challenging to drive over raised crossings.

3. Once a coupling is completed, there should be:

Three inches of space between the upper and lower fifth wheel.

No space between the upper and lower fifth wheel.

A moderate amount of space between the upper and lower fifth wheel.

When performing a visual check of coupling devices, you should make sure there is no space between the upper and lower fifth wheel. Ensure that the locking jaws are securely closed around the kingpin.

4. An open automobile window in cold weather may indicate that the driver is:

Driving impaired.

Inappropriately dressed.

Using the heat inside their vehicle.

Enjoying the fresh air.

It is important to observe other drivers' behaviors and identify clues that indicate when person could be driving impaired. Drivers who have had too much to drink, are sleepy, are on drugs, or are ill can present hazards to other drivers. A person driving with their window open in cold weather may be impaired.

5. When parking a double or triple vehicle:

You should back into your parking spot.

You should park on the roadway.

You should park in a location where you can pull forward to exit.

You should ask people to move their vehicles.

When parking a double or triple, you should select a parking spot where you can pull forward when leaving. Be aware of the arrangement of the parking lot to avoid the need for a long and difficult exit.

6. If feeling sleepy while driving, you should:

Press on and finish the trip.

Drive faster to arrive to your destination sooner.

Leave the road and take a nap.

Take an energy pill.

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.