CDL Written Exam
CDL Practice Tests
Practice questions for every section of the CDL written exam, each one with the reason the right answer is right. Read the section, or take it as a scored test — both are free, with no card and no card.
Take a free practice test nowCDL General Knowledge Practice Test
Free CDL general knowledge practice test questions with explanations — inspection, vehicle control, safe driving, hazard awareness, night and mountain driving, and stopping distance.
15 practice questionsCDL Air Brakes Practice Test
CDL air brakes practice test with explanations: governor cut-in and cut-out, low-air warning, spring brakes, applied leakage limits, brake lag, and brake fade.
10 practice questionsCDL Combination Vehicles Practice Test
CDL combination vehicles practice test questions with explanations: coupling and uncoupling, fifth-wheel checks, off-tracking, jackknife recovery, and rollover prevention.
10 practice questionsCDL Pre-Trip Inspection Practice
CDL pre-trip inspection practice: the walk-around order, tread depth and defect limits, steering play, lights, leaks, coupling checks, and the air brake test sequence.
6 practice questionsCDL HazMat Practice Test
CDL HazMat endorsement practice test with explanations: shipping papers, placarding, hazard classes, segregation, the ERG, security rules, and the TSA background check.
5 practice questionsCDL Tanker Practice Test
CDL tank vehicle practice test with explanations: liquid surge, baffled versus smooth-bore tanks, outage, high center of gravity, and safe braking with a liquid load.
3 practice questionsCDL Doubles and Triples Practice Test
CDL doubles and triples practice test with explanations: trailer order, converter dolly coupling, crack-the-whip, rollover risk, and air supply to rear trailers.
3 practice questionsCDL Passenger Practice Test
CDL passenger endorsement practice test with explanations: standee line, prohibited hazardous materials, railroad crossing procedure, brake checks, and disabled bus handling.
3 practice questionsFree — every section, every question
All CDL practice tests are free. No card, no membership. The CDL Training Center runs the same chapters as timed quizzes and tracks your score, also free. Pro ($14.99 a month or $99.99 a year) is only for the diagnostics, handbooks and business tools.