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You’ll often see Longer Combination Vehicles (LCVs) on Idaho’s highways. They are truck-tractors pulling two or three trailers with a gross vehicle weight (GVW) greater than 80,000 pounds. Each state has its own regulations regarding transportation and road safety. In the Gem State, triple towing is allowed under specific conditions. The overall length cannot exceed 115 feet, and the power unit must have enough power and traction to maintain at least 20 miles per hour on any uphill grade.
The Department of Motor Vehicles (DMV) requires all aspiring LCV drivers to pass a -question knowledge exam before they may operate double- or triple-trailer configurations. This test is based on Section 7 (Doubles and Triples) of the official Commercial Driver’s License Manual (Idaho CDL Handbook 2026). To pass this exam, you must answer at least 16 questions (80%) correctly.
Our Idaho CDL Double/Triple Trailers Practice Tests can help you achieve a passing score on your first attempt. They cover topics such as coupling and uncoupling twin and triple trailers, pre-trip inspections specific to LCVs, parking techniques, and space management. Now you’re about to take the fourth practice test in this series. Add flexibility to your learning journey by training with this intuitive tool on your own schedule. It is available online, and you can access it anytime, anywhere in the world.
To support your learning, you will receive immediate feedback on each of your answers. Please pay attention to the detailed explanations and note them in a notebook or notebook app for future reference. This valuable insight can help you learn from your mistakes to avoid repeating them on exam day. Our practice tests are about understanding, not speed. Many of them are untimed, including this one. Take as long as you need to answer each question, and complete your training sessions at your own pace.
It is easier to master general commercial driving theory when you have the best learning tools at your disposal. The content and format of our Free Idaho CDL Permit Practice Test are similar to those of the official General Knowledge Exam. If you haven’t yet obtained a Class A CDL, you can use this tool to build a strong foundation for your dream career.
M.S. (MIT, Columbia), Chief Educational Researcher. ACES member (Society for Editing). Verifies all 50 state tests against official handbooks weekly.
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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 ID 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.
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