CDL Knowledge Center

The CDLTest360 Knowledge Center is a free, growing library of study guides for drivers preparing for a commercial driver's license. Every article is grounded in the public Federal Motor Carrier Safety Administration (FMCSA) regulations and the AAMVA model CDL manual that every state DMV or DPS uses as its source. We publish walkthroughs, test strategies, endorsement deep dives, and pre-trip inspection breakdowns to help new and returning drivers pass on the first attempt.

Whether you're a first-time applicant studying for the General Knowledge exam, an experienced driver adding an Air Brakes, HazMat, or Combination Vehicles endorsement, or a fleet trainee working through ELDT theory hours, you'll find plain-English explanations, checklists, and worked examples here. Our Pre-Trip Inspection guides break down the seven-step method examiners use so nothing gets missed on skills-test day.

Beyond the knowledge exam, we cover the working reality of trucking: pay ranges, home-time expectations, day-in-the-life accounts, choosing between company driving and owner-operator, and how to pick a CDL school. Our state guides walk you through the specific DMV or DPS procedures, fees, medical card requirements, and skills-test scoring for the states we cover — starting with Florida, Texas, and California, with more added regularly.

Articles cite the FMCSA sections and state manuals they draw from so you can verify anything you read here against a primary source. Nothing on this site replaces your state's official CDL manual, but it's designed to make that manual dramatically easier to study from.

New to the site? Start with our free CDL practice tests to see where you stand, then use the articles here to shore up the topics that gave you trouble. Bookmark the page — we publish new material every week.