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Already hold a Class A CDL? Take the next step by earning a T endorsement, which allows you to legally operate double or triple trailer combinations. To do this, you must pass the Double/Triple Trailers (T) Endorsement Test. The official Missouri exam consists of 20 multiple-choice questions. A passing score requires answering at least 16 correctly (80%). If you don’t pass, the Missouri State Highway Patrol (DOR) requires you to wait at least one business day before retesting. Additional fees may apply after multiple failures.
Our Free Missouri CDL Double/Triple Trailers (T) Endorsement Practice Tests are scientifically designed and mirror the actual DOR test format to help you pass on your first attempt. Real-time feedback, hints, and AI-powered learning tools make studying faster and far more effective than traditional methods like study guides.
All questions are based on the most recent Missouri CDL Manual. Topics include coupling and uncoupling of trailers, preventing jackknifing and rollovers, the importance of smooth steering (avoiding the “crack-the-whip” effect), maintaining safe following distances, applying correct braking techniques in longer combination vehicles, and performing inspections on all trailers. This just scratches the surface of what you must know to pass the exam. Take the guesswork out and allow our practice tests to fully prepare you for it.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
Getting your T Endorsement in Missouri makes you instantly eligible for higher-paying jobs. With major freight routes along I-70, I-44, and I-55 and logistics hubs in St. Louis, Kansas City, Springfield, and Columbia, CDL drivers who hold the T endorsement are in constant demand. Top carriers like FedEx Freight, Old Dominion, and ABF frequently hire Missouri drivers with this credential.
Most double and triple trailer combinations use air brakes, so you’ll need to pass the Air Brakes Knowledge Test to remove the “L” restriction from your CDL. We offer practice tests for this requirement as well as for other Missouri-specific endorsements, including: N (Tank Vehicles), H (Hazardous Materials), X (Hazmat/Tanker Combo), P (Passenger Vehicles), and S (School Buses). We’ve got your prep work covered for these as well!
This practice test is Practice Test Two of our Missouri CDL Double/Triple Trailers series. Complete Practice Test One and visit our full collection of Show-Me State-specific endorsement and air brake practice exams. Each is designed to speed your learning and help you pass the knowledge exam on your first attempt!
Driver’s Ed is - nobody wants to set foot inside the DOR. 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 MO 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 DOR.
