- Updated for January 2025
- Based on 2025 PA commercial driver's license manual
Free PA CDL Double/Triple Trailers Practice Test 2025
Looking to add the Double and Triple Trailers endorsement to your Pennsylvania Commercial Driver’s License (CDL)? Smart idea! This endorsement significantly expands your earning potential by permitting you to haul more diverse loads. And, whether driving through the Appalachian Mountains, or the farmland and natural resource areas of its state plateaus, you’ll see a good mix of terrain in Pennsylvania. To achieve this endorsement, you’ll need to pass a 20-question multiple-choice knowledge test with a score of 80% (16 correct answers). That’s it! For this addition to your CDL, a skills test (the hardest part) isn’t needed. Once you pass this knowledge test, you’ll receive the “T” endorsement on your CDL, authorizing you to pull two or three trailers (where allowed) (Pennsylvania CDL Handbook 2025).
While the minimum age requirement to travel across state lines is federally mandated to be 21, in the Keystone State, you need only be 18 years of age to add this certification to your CDL. So, there is some instant intrastate opportunity available to younger drivers. Even with a Double/Triple Trailers endorsement, triple trailers are not allowed in Pennsylvania. The good news is that double trailers are often used throughout Pennsylvania for the transport of steel and industrial products (Pittsburgh is a major hub), coal and natural gas in the western part of the state, agricultural products like mushrooms, dairy, poultry, and apples, consumer goods and electronics, and chemicals and pharmaceuticals (especially from the Philadelphia area). I know! This sounds incredible. But how can you best prepare for the test?
Staying focused can be tough due to the enormously daunting amount of information found online on this subject, but our online Pennsylvania CDL Double/Triple Trailers practice test methodically streamlines this experience. Up to date as of January 2025, the test features 20 multiple-choice questions reflecting what you will see at the DOT on your test day! Plus, with real-time feedback on each answer, you learn as you go versus the usual (and less effective) end-of-test corrections faced elsewhere.
You only need to pass the official knowledge test. After practicing with our free tests and building your confidence, it will be time to apply at the DOT. Just take your documents, pay the fee, pass the test, and restart your transport career on a whole new and improved level!
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual PA DOT exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- When you're pulling more than one trailer, which trailer should be the first one behind the tractor?
- Which of these statements about quick steering movements and doubles/triples is true?
- You are driving a 100-foot double trailer combination at 50 mph. The road is dry and visibility is good. You should keep at least ____ seconds of space ahead of you.
- Before connecting a converter dolly to a second or third trailer, you should check the height of the trailer. The trailer height is right if
- You are driving a 100-foot double trailer combination at 30 mph. The road is dry and visibility is good. You should keep at least ____ seconds of space ahead of you.
- With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. When you do this, you should hear
- Empty trucks
- Which of these statements about handling doubles and triples is true?
- Before you can supply air to the air tanks of a second trailer, you need to
- You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking, you should
- How can you be sure that you supplied air to a second trailer?
- What is likely to happen if the pintle hook is unlocked while the dolly is still under the second trailer?
- You want to hook your combination to a second trailer that does not have spring brakes. To do this without wheel chocks, you should
- Which of these statements about managing space to the sides is true?
- The crack-the-whip effect that troubles trucks with trailers is most likely to tip over
- You are visually checking the coupling of a converter dolly to the rear trailer. How much space should there be between the upper and lower fifth wheel?
- You are pulling doubles. A set of trailer wheels goes into a skid. Which of the following is most likely to occur?
- You are doing a walk-around inspection of a double or triple trailer rig. You should be sure that the converter dolly air tank drain valves are ______ and the pintle hook is _______.
- A converter dolly is
- A converter dolly consists of a ______ wheel and ________ axles.
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