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Ready to boost your earning potential in the Grand Canyon State? The Doubles/Triples (T) Endorsement is one of the smartest ways to do that! This endorsement on your Arizona Class A CDL will qualify you to operate double and triple trailer combinations. Carriers across Arizona operate on its major roadways, including I-10, I-40, and I-17, and are constantly looking for T-endorsed drivers for their transport needs.
You must already hold a valid Arizona Commercial Learner’s Permit (CLP) or a Class A Commercial Driver’s License (CDL) to sit for the Arizona Doubles/Triples Knowledge Test. This test is based on Section 7 of the Arizona Commercial Driver License Manual and consists of 20 multiple-choice questions. To pass, you must answer at least 16 questions (80%) correctly. If you fail, the Arizona MVD requires you to wait at least one business day before retesting, with additional fees applying. Effective preparation for this exam will ensure you pass on your first attempt, avoiding delays and added fees. That is where our suite of Arizona-specific practice tests comes in!
M.S., Chief Educational Researcher (ACES member)
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Because only four incorrect answers are allowed, there is little room for error. Our team of experts has created free Arizona CDL Doubles/Triples Knowledge Practice Tests designed to mirror the official exam format. You’ll get real-time feedback, hints, and AI-powered study tools to boost retention and speed learning. Our practice tests cover coupling and uncoupling procedures, managing the “crack-the-whip” effect, preventing rollovers and jackknifing, adjusting following distances, and conducting proper inspections – every topic you’ll need to pass on your first try.
Once you earn the T Endorsement, you can legally haul doubles or triples (where permitted) for carriers like FedEx Freight, Old Dominion, and UPS, instantly adding a new array of opportunities. You must also pass the Arizona Air Brakes Knowledge Test and complete your CDL skills exam in a vehicle with full air brakes. Doing this removes the “L” or “Z” restriction. Simply put, with that restriction in place, you cannot pull most doubles or triples. Our Air Brakes Practice Tests can help ensure you’re ready.
Arizona CDL holders can also pursue endorsements for N (Tank Vehicles), H (Hazardous Materials), X (Tank + Hazmat Combo), P Passenger Vehicles), and S (School Bus Drivers). We offer Arizona-specific practice tests for each endorsement.
Explore our full set of Arizona CDL practice exams to prepare!
Driver’s Ed is - nobody wants to set foot inside the MVD. 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 AZ 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 MVD.
