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. Test questions come from the Georgia 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. Using the trailer hand valve while driving:

Will help you turn safely.

Will stop your trailer safely.

Can cause a skid.

Is impossible.

Never use the trailer hand valve while operating your vehicle. Using the trailer hand valve while driving can cause your trailer to skid.

2. What are placards?

Signs placed on a vehicle to identify cargo hazards

A type of tire used in snowy conditions

Logs kept inside the vehicle

Journals for mileage

Placards are diamond-shaped warning signs that are placed on the outside of vehicles carrying hazardous materials. Placards are used to identify the specific hazard classes of the cargo being carried.

3. If driving in a foggy area, you should not:

Decrease your speed.

Increase your speed.

Use your low beam headlights.

Turn on your four-way flashers.

It is safest not to drive in foggy areas. However, if you must drive through fog, you should slow down, use your low beam headlights and fog lights, and turn on your four-way flashers.

4. An Anti-Lock Braking System (ABS):

Decreases your braking distance.

Increases your braking distance.

Creates a loud squeaking noise when being used.

Helps to ensure control while braking.

ABS increases a driver's control during braking. It will not necessarily change the distance needed for a vehicle to come to a complete stop.

5. Before coupling, you can secure a second trailer by:

Depleting its air tanks.

Leaning it against a wall.

Removing its emergency line.

Setting wheel chocks.

If you are attaching a second trailer to a combination but you have doubts about the trailer's brakes, you should use wheel chocks to secure the trailer in place while coupling.

6. If the brake pads rub against the brake drums and create too much heat:

The brakes will stick.

The brakes will become extra sensitive.

The brakes may stop working.

The air compressor will kick on to cool the brakes.

Brakes heat up with use. If they are overused and become too hot, expansion and chemical changes will make them less effective and eventually cause them to stop working altogether. This is known as "brake fade."

7. When uncoupling a triple trailer rig:

The second trailer should be uncoupled first.

The third trailer should be uncoupled first.

The order of uncoupling is not important.

The heaviest trailer should be uncoupled first.

When uncoupling a triple trailer rig, it is important to uncouple the third trailer first. Uncouple the remaining trailers as you would normally uncouple a double.

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