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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 Pennsylvania doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The PA CDL doubles triples test covers the following sections of the Pennsylvania CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this PA CDL practice test now to prepare for the actual test!
1. If your ABS fails:
the first step is to get the vehicle off the road and stop.
you will still have normal brake functions.
you will have no brake function, and could lose control.
your tires might grab unexpectedly and you could lose control.
2. To prevent rollover, you should:
drive slowly around on ramps and off ramps.
go slowly around turns.
keep the cargo as close to the ground as possible.
All of the above.
3. Which of the following is a good way to avoid becoming an aggressive driver?
Keep your following distance reasonable.
Be realistic about your travel time.
Avoid talking on your cell phone.
All of the above.
4. If you unlock the pintle hook with the dolly still under the rear trailer:
steam and boiling water can spray under pressure.
the brakes could be damaged by the combined forces of the springs and the air pressure.
the dolly tow bar may fly up.
your vehicle might roll away.
5. "Bobtail" tractors are:
tractors with a tank.
tractors with two trailers.
tractors without semitrailers.
heavily loaded trailers.
6. In a combination vehicle, ________ is most likely to turn over.
the trailer behind the tractor
the tractor
the last trailer
All of the above.
7. To make the brakes work, air brakes use:
hydraulic air.
compressed air.
carbon monoxide.
8. When you turn suddenly, which trailer is most likely to turn over?
The front trailer
The rear trailer of doubles
The last trailer of triples
None of the above.
9. Drivers transporting cargo are responsible for:
making sure the cargo is properly secured.
recognizing overloads.
inspecting the cargo.
All of the above.
10. If your trailer starts to skid, you should:
release the brakes.
steer in the opposite direction.
pump the brakes.
lock the brakes.
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Doubles Triples PA CDL Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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