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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. As you approach off ramps and on ramps, remember:
that the posted speed limit may be safe for automobiles, but may not be safe for larger vehicles.
that braking and turning at the same time can be a dangerous.
All of the above.
2. You are driving a modern truck with a manual transmission. When going down a hill you should usually:
use a lower gear than would be required to go up the hill.
shift into neutral and coast.
use the same gear you would use to go up the hill.
3. The ABS malfunction lamp on the instrument panel is:
4. Which of the the following statements about fatigue is true?
Fatigued driving is one of the leading causes of accidents.
Fatigue impairs your vision and judgment.
All of the above.
5. Radial and bias-ply tires:
should be used together.
should not be used together.
should be used together only when driving in packed snow.
6. If you must stop on a one-way or divided highway, place your warning devices:
100 feet, 200 feet, and 300 feet toward the approaching traffic.
10 feet, 50 feet, and 150 feet toward the approaching traffic.
10 feet, 100 feet, and 200 feet toward the approaching traffic.
7. Emergency brakes are:
required on all vehicles.
not required on doubles.
not required on buses.
8. Regardless of its size, cargo should have at least ___ tie-downs.
9. When driving a truck with more than 1 trailer, drivers should:
allow more following distance.
be especially careful in adverse conditions.
All of the above.
10. Doubles:
are less likely to rollover than straight trucks.
require more reaction time than straight trucks.
None of the above.
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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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