CDL Study Guide — 185+ High-Yield Terms & Concepts

191 high-yield terms & concepts for the Commercial Driver's License knowledge tests

Everything a new commercial driver needs to pass the CDL knowledge tests and get their license — 191 high-yield terms & concepts across 11 parts: Exam Overview (Class A/B/C, CLP, ELDT, medical card, skills test), General Knowledge (34 concepts — required for ALL classes), Air Brakes (22), Combination Vehicles (20), and all five endorsements decoded (HazMat H 17, Tanker N 13, Passenger P 14, School Bus S 14, Doubles/Triples T 14), plus Final Review (17) and Test-Day Strategy (12). Includes 9 appendices (A–I): complete test/format reference, air-brake numbers & stopping-distance quick reference, endorsement quick map, 4-week study plan, 20 practice questions with answers, quick glossary, 3-part skills test in depth, General Knowledge 50-question blueprint, and a class-by-class roadmap. FMCSA-current: ELDT requirement (since Feb 7, 2022), CLP 14-day hold, 80% pass per test, medical card + self-certification. Independent study aid — not affiliated with or endorsed by the FMCSA, USDOT, any state DMV/DPS, or any training provider.