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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. When backing, you should:
use a helper if possible.
avoid using the mirrors.
back quickly.
2. If an item placed on a flatbed trailer is 7 feet long, it should have __ tie-downs.
3. When driving a double or triple:
all trailers should have the same weight.
the more heavily loaded trailer should be in the rear.
the more heavily loaded trailer should be directly behind the tractor.
4. Retarders:
reduce braking distance.
help slow a vehicle, reducing the need for using brakes.
improve gas mileage.
5. Which of the following statements about traveling alongside other vehicles is true?
You should travel next to other vehicles whenever possible.
You should avoid traveling next to other vehicles whenever possible.
You should never drop back or pull forward to make sure the other driver can see you.
6. Watch out for black ice:
when the temperature is above freezing and the road is dry.
any time the temperature is below freezing and the road looks wet.
when it is snowing.
7. If an aggressive driver confronts you, you should NOT:
try to let them pass.
ignore gestures.
make eye contact.
8. What can cause poor traction?
Too little weight on the driving axles.
Too much weight on the steering axle.
Overloading the truck.
9. If you have to drive off the road, you should:
fully apply the brakes until your speed has dropped to about 20 mph.
brake as hard as you can to maintain control.
keep one set of wheels on the pavement, if possible.
10. Before driving a vehicle with a dual air system, allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
50 psi
75 psi
100 psi
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WA Doubles Triples CDL 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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