CDL Practice Test 2026 — 30 FREE Questions + Answers (General Knowledge) | Set 4

Think you're ready for your CDL exam? Test yourself with this free 30-question CDL General Knowledge practice exam covering the topics most likely to appear on your actual state permit test — air brakes, combination vehicles, hours of service, vehicle inspection, and safe driving practices. Each question includes the correct answer and a clear explanation, so you're not just memorizing — you're actually learning why. CDL General Knowledge Practice Test — Set 4 (30 Questions) Topics covered in this set: Driving Safely / Basic Control (14 questions) Wheel seal / hub oil leak identification Convex mirror distortion effects Total stopping distance definition Hydroplaning recovery response Runaway escape ramp purpose Backing toward the driver's side Construction zone speed management Low beam headlight visibility range Fog driving technique Crosswind effects on empty high-profile trailers Headlight glare recovery time Blind intersection procedure ABS system purpose Accident scene first priority Air Brakes (6 questions) Air compressor governor cut-in pressure Wet tank (supply tank) function Automatic slack adjuster purpose Foot valve / treadle valve function Dual air brake system purpose ABS malfunction lamp response Combination Vehicles (6 questions) Sliding fifth wheel purpose Locking pin engagement check Landing gear low range vs. high range use Glad hand color coding Fifth wheel plate gap inspection Landing gear support blocks on soft ground Transporting Cargo Safely (4 questions) Aggregate working load limit (tiedown) rule Cargo securement re-check mileage requirement Steering axle overload effects Covering loose bulk cargo requirement Difficulty level: Advanced (4/5) — designed to mirror the specificity and trickiness of real CDL exam questions. 📘 Want more practice? We've got full-length CDL exam simulators, printable cheat sheets, and topic-by-topic question banks covering General Knowledge, Air Brakes, Combination Vehicles, and Hazmat endorsements. 👉 examprepprime.com ✅ What this video covers: CDL General Knowledge practice questions Air brake system basics Pre-trip vehicle inspection Hours of service rules Safe driving practices for commercial vehicles If this helped, drop a comment with your score and subscribe for new CDL practice sets every week. Keywords: CDL practice test, CDL test questions, CDL general knowledge test, CDL permit test, commercial drivers license test, CDL exam questions and answers, how to pass CDL test, CDL air brakes test, CDL practice test 2026, free CDL practice test, CDL study guide, truck driver test, CDL written test, DMV CDL practice test, CDL test prep, class A CDL test, combination vehicles test, CDL hours of service #CDLTest #CDLPracticeTest #TruckDriverTraining --- DISCLAIMER: This video is for educational and exam-preparation purposes only. Always verify current requirements with your state's Department of Motor Vehicles or Department of Transportation, as CDL testing standards can vary by state and change over time.