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
Passing Score

1. Using the trailer hand valve while driving:

Explanation
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?

Explanation
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:

Explanation
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):

Explanation
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:

Explanation
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:

Explanation
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:

Explanation
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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