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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 you are feeling sleepy, you should:
pull off the road and rest or take a nap.
increase your speed to get to the destination quicker.
slow down and drive on the shoulder of the road.
2. Which of the following statements about retarders is NOT correct?
Retarders help you avoid skids.
You should turn the retarder off whenever the road is wet, icy, or snow covered.
Retarders help slow a vehicle, reducing the need for using brakes.
3. What happens when the center of gravity of a truck moves higher up from the road?
The vehicle is more stable while turning.
The truck becomes easier to turn over.
It is easier it is to turn around corners.
4. Which of the following is not proper tie-down equipment:
Bungee cords
5. An ABS system:
requires a change in the way you brake.
helps increase a vehicle's stopping power.
is a safety anti-skid braking system.
6. The trailer hand valve should:
be used in driving.
never be used to test the trailer brakes.
never be used for parking.
7. When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
strong wind.
the rear trailer of a triple.
rearward amplification.
8. Emergency lines are often coded with the color ___ to keep from getting them mixed up with the service line.
9. When parked on the side of the road, you should:
use the 4-way emergency flashers.
flash your brake lights.
turn off all lights.
10. Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
anti-lock brakes.
hydraulic brakes.
a rear backup camera.
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AZ CDL Doubles Triples Test

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