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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. To prevent rollover, you should do all of the following except:
drive slowly around turns.
keep the load centered on your rig.
put the lightest parts of the cargo under the heaviest parts.
2. The safety valve installed in the first tank the air compressor pumps air is set to open:
if there is too much pressure.
at 30 psi.
if there is too little pressure.
3. Because of the "crack-the-whip" effect, doubles and triples:
are more likely to turn over than other combination vehicles.
are more likely to run out of gas than other combination vehicles.
are much slower than other combination vehicles.
4. Which of the following road surfaces freezes first?
Open roads
5. To avoid becoming an aggressive driver you should:
make gestures to other drivers.
give other drivers your full attention.
give other drivers the benefit of the doubt.
6. To prevent rollover, you should:
keep the cargo as close to the ground as possible.
place the cargo near the rear of the trailer.
put the lightest parts of the cargo under the heaviest parts.
7. With a dual air brake system:
each system has its own air tanks, hoses and lines.
each system shares the same lines and hoses.
each system shares air tanks.
8. Before each trip, you must make sure:
the cargo has a high center of gravity.
your cargo obscures your view to the sides.
the cargo is balanced and secured.
9. When driving a double or triple:
the more heavily loaded trailer should be in the rear.
all trailers should have the same weight.
the more heavily loaded trailer should be directly behind the tractor.
10. To prevent a rollover, the driver should:
make quick lane changes if possible.
drive on the shoulder if possible.
drive slowly around corners, on ramps, and off ramps.
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AZ Doubles Triples 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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