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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 coupling a double or triple, ________ should be attached last.
the trailer right behind the cab.
the middle trailer.
None of the above.
2. When more than one semitrailer is behind the tractor:
The order doesn't matter.
the lighter trailer should be in the rear.
the more heavily loaded semitrailer should be in the rear.
3. What happens when the center of gravity of a truck moves higher up from the road?
The vehicle is more stable while turning.
The truck becomes easier to turn over.
It is easier it is to turn around corners.
4. When possible, you should park:
so you will have to back up when you leave.
so you will be able to pull forward when you leave.
on the shoulder.
5. The application pressure gauge:
tells you how much pressure is in the air tanks.
shows how much air pressure is being applied to the brakes.
protects the tank and the rest of the system from too much pressure.
6. Strong winds can make it difficult to stay in your lane especially when driving:
vehicles with ABS.
lighter vehicles.
heavier vehicles.
7. Dual tires:
should always come in contact with each other.
should come in contact with each other whenever possible.
should not come in contact with each other.
8. You should always adjust your speed to be able to stop within:
50 feet.
the distance you can see ahead.
the length of your vehicle.
9. Emergency equipment is:
only required when transporting hazardous materials.
10. When going down a steep downgrade, you should primarily brake using:
the service brakes.
the parking brake.
the braking effect of the engine.
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WA CDL 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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