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Welcome to Illinois! Whether you’re hauling cargo across I‑55, I‑80, or I‑57, adding the Doubles/Triples (T) Endorsement to your Illinois Class A CDL opens the door to many potential job opportunities and higher income. The (T) Endorsement gives you the legal authority to operate double and triple trailer combinations, setting you apart from those without it and giving you more flexibility and a competitive edge in the Illinois freight industry.
To obtain the T Endorsement in Illinois, you must pass the Doubles/Triples Knowledge Test, based on Section 7 of the Illinois Commercial Driver’s License Study Guide. The official exam includes 20 multiple-choice questions, and you must answer at least 16 correctly (80%) to pass. If you miss more than four questions, you must retake the test after waiting at least one business day. After three failed attempts, a 30-day waiting period kicks in, with even longer delays after additional failed attempts. Illinois is more punitive than most other states in this case, which is why we created tools to help you pass on your first try.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
Our Illinois-specific Double/Triple Trailers (T) Endorsement Practice Tests mimic the format used by the DMV exam. Each practice test comes with real-time feedback, hints to guide you to the right answer, and AI-powered study tools to help with memory retention and test speed. All questions on our Illinois T Endorsement Practice Tests are based on the latest Illinois CDL Manual and cover coupling and uncoupling procedures, how to prevent rollovers and jackknifing, managing the “crack-the-whip” effect, proper braking and following distance, and trailer inspection procedures.
You’ll also need to make sure the “L” or “Z” restriction has been removed from your CDL, since most double and triple trailers use air brakes. To do this, you must pass the Air Brakes Knowledge Test and complete a skills test in an air brake-equipped vehicle. We also offer Illinois Air Brakes Practice Tests to help you clear that restriction.
Once you’ve earned your T Endorsement, consider expanding your qualifications even more. CDL holders can pursue N (Tank Vehicles), H (Hazardous Materials), X (Tank plus Hazmat Combo), P (Passenger Transport), and S (School Bus Operation) endorsements. We offer free Illinois-specific practice tests for each of these to help you pass on your first attempt.
Check out our complete suite of Illinois-specific practice tests to prepare for each exam!
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 2025 IL 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.
