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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. To test your parking brake, do the following:
Set the parking brake, and gently pull against it in a low gear.
Speed up to 5 mph, then set the parking brake.
Set the parking brake while going downhill.
2. A trailer jackknife is more likely to happen when the trailer is:
loaded to its full capacity.
3. Your vehicle should be equipped with all of the following except:
Warning devices for parked vehicles
Spare electrical fuses
Instructions on how to perform a vehicle inspection test
4. When driving a double or triple, you should:
increase your following distance.
drive in the left lane whenever possible.
decrease your following distance.
5. Under a pressurized system, the radiator cap:
should never be removed until the system has cooled.
should never be hot.
should be removed when the coolant is hot.
6. Engine oil pressure should come up to normal within _________ after the engine is started.
two minutes
five minutes
7. Which of the following statements about doubles/triples is true?
Doubles/triples may have to go faster around corners than single trailer combination vehicles.
A safe speed on a curve for a single trailer combination vehicle may be too fast for a double/triple.
Doubles/triples are more stable than other CMVs.
8. Weight that is loaded so there is a high center of gravity:
reduces the chance that the load will shift to the side or fall off.
causes greater chance of rollover.
makes a vehicle easier to handle.
9. When you push in the red trailer air supply knob, this will:
supply air to the emergency supply lines.
open the emergency line shut-off valve at the rear of the last trailer.
disconnect the air lines from the trailer.
10. If the fifth-wheel locking lever is not locked after the jaws close around the kingpin:
the coupling is not right and you should not drive until you get it fixed.
the parking brakes are on and your vehicle is safe to drive.
the parking brakes are on and the wheels are chocked.
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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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