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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 driving in very hot weather, you may have to:
decrease your following distance.
reduce your speed to prevent overheating.
increase your speed until the tires cool off.
2. Dual tires:
should come in contact with each other whenever possible.
should not come in contact with each other.
should always come in contact with each other.
3. If you unlock the pintle hook with the dolly still under the rear trailer:
your vehicle might roll away.
the dolly tow bar may fly up.
the brakes could be damaged by the combined forces of the springs and the air pressure.
4. When driving trucks with trailers, drivers should:
avoid making sudden movements with the steering wheel.
make quick lane changes.
push the brake pedal to the floor when braking.
5. Skids caused by acceleration can usually be stopped by:
taking the foot off the accelerator.
applying the brakes firmly.
coming to a complete stop.
6. When you see you will need to slow down, you can warn drivers behind you by:
tapping the brakes a few times.
slamming on the brakes.
turning on the right turn signal.
7. For safe handling, the heaviest trailer should be:
the last trailer.
the second trailer in a triple.
behind the tractor.
8. When the wheels of a trailer lock up, which of the following is most likely to occur?
The trailer will tend to push the towing vehicle sideways (tractor jackknife).
The trailer will tend to swing around (trailer jackknife).
The trailer will the trailer has overturn.
9. Drivers transporting cargo are responsible for:
inspecting the cargo.
recognizing overloads.
All of the above.
10. When driving at night, you should use ________ when you can.
low beams
high beams
emergency flashers
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AZ CDL Doubles Test

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