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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Arizona doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The AZ CDL doubles triples test covers the following sections of the Arizona CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this AZ CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Arizona.
1. If the drive wheels begin to spin, you should:
accelerate smoothly and change gears as necessary.
take your foot off the accelerator.
apply your brakes all the way.
2. If there is a fire in your vehicle, do NOT:
pull into a service station.
notify emergency services.
park in an open area.
3. When you back under a trailer:
use lowest reverse gear.
back the tractor slowly.
All of the above.
4. Weight that is loaded so there is a high center of gravity:
causes greater chance of rollover.
makes a vehicle easier to handle.
reduces the chance that the load will shift to the side or fall off.
5. If there is a cargo fire in a van or box trailer, you should:
keep the doors shut.
open the doors, especially if your cargo contains hazardous materials.
enlist the help of bystanders.
6. Blocking and bracing are:
driving techniques used to regain control when your drive wheels start to skid.
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
used to keep cargo from sliding and to prevent movement of cargo.
7. Watch out for black ice:
when the temperature is above freezing and the road is dry.
when it is snowing.
any time the temperature is below freezing and the road looks wet.
8. You as a driver should always:
make emergency plans when you see a hazard.
reduce your following distance.
stay in your lane.
9. Pre-trip inspections of doubles and triples should:
take more time than inspecting straight trucks.
take less time than inspecting straight trucks.
be done by the shipper.
10. Which of these statements about brakes is true?
The lighter the vehicle, the more heat the brakes absorb to stop it.
Brake fade does not result from excessive heat.
None of the above.
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Doubles Triples AZ CDL Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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