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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 Washington doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The WA CDL doubles triples test covers the following sections of the Washington CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this WA CDL practice test now to prepare for the actual test!
1. While crossing railroad tracks, you should:
not shift gears.
shift down.
shift up.
2. You should be especially alert for drunk drivers:
around shopping areas.
in the morning.
late at night.
3. When parked on the side of the road, you should:
use the 4-way emergency flashers.
turn off all lights.
flash your brake lights.
4. When checking the lights before driving:
make sure the parking brake is not set.
you should turn off the engine.
you should check them from inside the vehicle.
5. When you turn suddenly, which trailer is most likely to turn over?
The front trailer
The last trailer of triples
The rear trailer of doubles
6. When you discover a fire, if the trailer doors are hot you should not open them because:
the temperature of the trailer should not be changed in any way.
with air many fires do less damage.
opening the doors lets air in and may make the fire flare up.
7. Before each trip, you must make sure:
your cargo obscures your view to the sides.
the cargo has a high center of gravity.
the cargo is balanced and secured.
8. What is Gross Vehicle Weight?
The total weight of a single vehicle, excluding its load
The total weight of the cargo
The total weight of a single vehicle, including its load
9. If you unlock the pintle hook with the dolly still under the rear trailer:
the dolly tow bar may fly up.
the brakes could be damaged by the combined forces of the springs and the air pressure.
your vehicle might roll away.
10. Over-length loads:
require special transit permits.
may require special equipment such as "wide load" or flags.
All of the above.
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WA 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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