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If you’re preparing to add the Double/Triple Trailers endorsement to your Indiana Commercial Driver’s License (CDL), the main challenge is passing a 20-question multiple-choice knowledge test. You’ll need a score of 80% (16 correct answers) to get this endorsement. Once you’re certified, the “T” endorsement on your CDL authorizes you to pull two or three trailers (where laws allow) and drive combination vehicles that require this added expertise (Indiana CDL Handbook 2025).
In the “Hoosier State,” even with a Double/Triple Trailers endorsement, you’re only allowed to pull double trailers. But make no mistake, earning this endorsement not only elevates your credibility in the transport industry but also dramatically increases your job prospects and earning potential. Double trailers are often used throughout the Indiana for the transport of construction equipment, heavy machinery, and building materials for construction sites. Additionally, with this certification you can participate in cross-docking operations in Indiana logistics hubs. You may be saying to yourself, “This sounds incredible! But how can I best prepare for the test?”
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
There’s plenty of online information out there, but sifting through it can get overwhelming fast. What you need is a systematic, focused approach. That’s exactly what our online practice test offers. Updated as of December 2025, it includes 20 multiple-choice questions that resemble what you will face at the BMV on your test day!
With our online Indiana CDL Doubles/Triples practice test, you’ll receive instant, detailed feedback on your answers. If you answer incorrectly, you’ll immediately see why a different response is correct. Gone are the days of receiving an onslaught of feedback on multiple categories clumped together at the end of a test. Our real time approach aids in mental retention and solidifies the content as you go.
In Indiana, you only need to pass the knowledge test to add the “T” endorsement to your Class A or Class B CDL. There is no additional driving test. Once you’ve prepared, practiced with our free tests, and feel confident, simply apply at the BMV. Bring your documents, pay the appropriate fee, and pass the test to officially add the endorsement.
Looking for other Indiana-based CDL endorsements? Find tons of valuable information and practice tests here.
Driver’s Ed is - nobody wants to set foot inside the BMV. 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 IN 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 BMV.
