- Updated for January 2025
- Based on 2025 OR commercial driver's license manual
Free OR CDL Double/Triple Trailers Practice Test 2025
From the coastal and forested areas of the west to the mountainous terrain of the Cascades, you’ll see a good mix of terrain as you drive in Oregon. If you add the Double and Triple Trailer endorsement to your Oregon Commercial Driver’s License (CDL), you’ll unlock valuable new marketability and earning potential in the transport industry! This endorsement permits you to take on more types of transport jobs and immediately elevates you in the market. To get started, you’ll need to pass a 20-question multiple-choice knowledge test with a score of 80% (16 correct answers). Since this is an addition to your CDL, you’ve already done the heavy lifting. 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) (Oregon CDL Handbook 2025).
In the Beaver State, you must be at least 18 years of age to add this certification to your CDL, but the age requirement to travel across state lines is federally mandated at 21 or older. Triple trailers are indeed allowed in Oregon; however, state law prohibits exceeding a maximum length of 105 feet for any combination vehicle. Double and triple trailers are used throughout Oregon for the transport of timber products (lumber, plywood, and paper), agricultural products (especially fruits, vegetables, nuts, wines, and dairy), technology and electronics (Portland is a major hub), manufactured goods and machinery, and seafood from the Pacific Ocean coastline. So, how can you best study for this test?
When preparing for your test, it’s exhausting looking at the massive volume of information online. Our online Oregon CDL Double/Triple Trailers Endorsement practice test simplifies this by offering a targeted, structured approach. Up to date as of January 2025, it includes 20 multiple-choice questions in the same format that you’ll encounter at the DMV on your test day! You’ll receive real-time feedback for each question, which has been shown to increase retention by avoiding the pile-up of end-of-test feedback you might receive elsewhere.
Remember: You only need to pass the official knowledge test. Once you’ve studied, practiced with our free tests, and feel prepared, then it’s time to head over to the DMV. Documents in hand, you’ll pay the fee, pass the test, and significantly level up your transport opportunities.
- 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 OR DMV 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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