CDL General Knowledge Practice Test

Practice the full General Knowledge question set for the CDL knowledge test. The written tests follow the federal model used in every state, so this one national set is the practice bank for all states. Every question comes with an instant explanation and its manual topic, so you learn the rule behind the answer instead of memorizing letters.

Free and unlimited. Every answer is explained, and your progress is saved only in your browser — no account needed.

How it works

Answer one question at a time. You will see immediately whether you were right, plus a short explanation and the manual topic for every question. At the end you get your score and can re-drill only the questions you missed.

400 questions · Topics: Vehicle Inspection, Space & Speed Management, Safe Driving & Hazard Perception, Impairment, Fatigue & Distraction, Cargo Handling & Securement, Emergencies & Skid Control, Special Driving Conditions, Railroad Crossings & Other, Powertrain & Brake System Basics, Coupling Basics, Accident Procedures, Alcohol & Drug Rules, Fire & Emergency Response, Tire & Suspension Faults, Brake Failure & Runaway Ramps, Fatigue & Hours-of-Service Awareness, Backing & Blind Spots, Winter & Cold-Weather Driving, Hot Weather & Tire Heat, Hazardous Materials Basics, Shifting, Gauges & Engine Controls, Cargo Securement Deep-Dive & Roadside Inspections.

About this practice test

This set drills the General Knowledge topics from the official CDL manual: vehicle inspection, space & speed management, safe driving & hazard perception, impairment, fatigue & distraction, cargo handling & securement, emergencies & skid control, special driving conditions, railroad crossings & other, powertrain & brake system basics, coupling basics, accident procedures, alcohol & drug rules, fire & emergency response, tire & suspension faults, brake failure & runaway ramps, fatigue & hours-of-service awareness, backing & blind spots, winter & cold-weather driving, hot weather & tire heat, hazardous materials basics, shifting, gauges & engine controls, cargo securement deep-dive & roadside inspections. The written tests are administered by your state licensing agency and follow the federal model used in every state; your state’s fees, scheduling and manual link are summarized on its state page.

When this set feels easy, switch to the Exam Simulator for a timed, no-feedback run, or review with flashcards.

Frequently asked questions

How many questions are on the General Knowledge test?

The General Knowledge test is typically 50 multiple-choice questions, and most states allow about an hour. Endorsement tests are shorter.

What score do I need to pass?

States require about 80% correct on CDL knowledge tests under the federal model. Confirm the current rule in your state’s official manual.

Are these the actual test questions?

No. These are original practice questions written from the same public manual topics the real test covers. They are designed to teach the material, not to reproduce the exam.