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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 2026).
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?
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
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 2026, 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.
Driver’s Ed is - nobody wants to set foot inside the DMV. That’s why millions of learners trust us for simple, visual, effective prep.
We are an officially recognized FMCSA Entry-Level Driver Training provider and a proud partner to over 2,500 libraries. We work with safety organizations like GHSA and the National Safety Council to help create safer roads for everyone.
Our trademarked system automatically saves questions you miss, creating personalized tests that target your weak spots until you’ve mastered the material.
Get smarter as you study. Our new AI-powered feedback provides detailed, question-level insights to help you understand the why behind each answer.
Go beyond the boring black-and-white manual. Our interactive handbook lets you read, listen with an MP3 audio version, or even chat with it to find the information you need, faster.
We build our practice questions from the current 2026 OR Driver Handbook and refine them using patterns recent test‑takers report.
Driver handbook • Knowledge‑test/permit overview • Fees & ID requirements • Office/appointment info
We mirror recurring themes (e.g., right‑of‑way traps, sign look‑alikes) and use similar distractors and wording styles.
We don’t collect or publish actual test items and we’re not affiliated with DMV.
