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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. When driving a double or triple, you should:
drive with emergency flashers on.
drive in the left lane whenever possible.
decrease your following distance.
increase your following distance.
2. The posted speed limit for a curve:
is safe for trucks or buses, but it may be too fast for cars.
is optional and may be exceeded.
may be too fast for many trucks or buses.
is safe for all vehicles.
3. If you are feeling sleepy, you should:
pull off the road and rest or take a nap.
slow down and drive on the shoulder of the road.
increase your speed to get to the destination quicker.
None of the above.
4. The heavier the vehicle:
the more work the brakes must do to stop it.
the higher the center of gravity will be.
the less work the brakes must do to stop it.
None of the above.
5. Hanging meat in a refrigerated truck can be:
a very stable load with a low center of gravity.
a very stable load if properly distributed.
a very unstable load with a low center of gravity.
a very unstable load with a high center of gravity.
6. If the fifth-wheel locking lever is not locked after the jaws close around the kingpin:
the parking brakes are on and the wheels are chocked.
cargo is properly blocked.
the parking brakes are on and your vehicle is safe to drive.
the coupling is not right and you should not drive until you get it fixed.
7. When a tire fails, you should:
push the brake pedal down gradually.
apply the brakes as hard as you can without locking the wheels.
stay off the brake.
brake in a way that will keep your vehicle in a straight line.
8. As you approach off ramps and on ramps, remember:
that braking and turning at the same time can be a dangerous.
to slow down  before you get on the curved part of an off ramp or on ramp.
that the posted speed limit may be safe for automobiles, but may not be safe for larger vehicles.
All of the above.
9. Your vehicle has air brakes. To stop, you should:
pull the parking brake control knob out.
release the accelerator, push in the clutch, and shift to Neutral at the same time.
push the brake pedal down.
pump the brake pedal 3 times.
10. For safe handling, the heaviest trailer should be:
the second trailer in a triple.
the last trailer.
behind the tractor.
None of the above.
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PA 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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