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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. When preparing to make a right turn, you should NOT turn wide to the left as you start the turn. Why?
It makes the turn harder.
A following driver may try to pass you on the right.
Turning wide to the left can cause your vehicle to tilt.
2. If your ABS malfunctions:
the service brake will not work.
you should immediately come to a complete stop.
you still have normal brake functions.
3. The earliest way to recognize that your trailer has started to skid is:
by releasing the brakes.
by checking the jackknife sensor.
by checking your mirrors.
4. To prevent rollover, you should:
drive slowly around corners.
drive in the left lane.
drive on the shoulder of the road when possible.
5. Texting while driving a CMV is:
acceptable if the message less than 140 characters.
acceptable if the message work-related.
6. You are driving a vehicle with air brakes when the low air pressure warning light and buzzer come on. You should:
pull off the road and stop immediately.
activate your hazard lights and drive to the nearest place where you can stop.
slow down and test your brakes.
7. When should you be particularly careful about high winds?
When going downhill
When emerging from a tunnel
When driving at night
8. In a dual air brake system, if one air system is very low on pressure:
you should pump the brakes to restore pressure.
either the front or rear brakes will not be operating fully.
you should drive and brake as you always have.
9. How can you tell if a converter dollie has ABS?
There is an ABS plaque on the right side of the dolly.
There is a red lamp on the left side of the dolly.
There is a yellow lamp on the left side of the dolly.
10. When you push in the red trailer air supply knob, this will:
supply air to the emergency supply lines.
open the emergency line shut-off valve at the rear of the last trailer.
disconnect the air lines from the trailer.
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AZ Doubles Triples CDL Test

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