CDL Practice Test
Getting your commercial driver's license? This free CDL practice test gives you 100 original multiple-choice questions with detailed explanations for every answer, covering the same knowledge areas as the official general knowledge exam — vehicle inspection, safe driving, cargo, air brakes, combination vehicles, and hazmat awareness.
CDL Practice Test: Exam Overview
- Exam format
- 50 multiple-choice questions (general knowledge) in most states
- Practice questions
- 100 practice questions
- Time limit
- Varies by state — typically about 60 minutes
- Passing score
- 80% — usually at least 40 of 50 questions correct
Key facts: CDL Practice Test
- Exam format: 50 multiple-choice questions (general knowledge) in most states
- Time limit: Varies by state — typically about 60 minutes
- Passing score: 80% — usually at least 40 of 50 questions correct
- This practice test: 100 free original multiple-choice questions with answers and explanations — no signup required.
Practice by topic
How to use this cdl practice test
Work through the questions topic by topic, or take them all at once for a full review. Every question includes a detailed explanation — read it even when you answer correctly, because understanding why an answer is right is what sticks on exam day. Use the Reset button in the score bar to retake the test and track your improvement.
Preparing for more than one exam? Browse all our Government & Public Safety practice tests — every test is free and includes answers with detailed explanations.
CDL Practice Test FAQs
How many questions are on the CDL general knowledge test?
In most states the general knowledge test has 50 multiple-choice questions drawn from the state CDL manual. Endorsement tests (air brakes, combination, hazmat, tanker, doubles/triples, passenger, school bus) are separate, shorter exams.
What score do I need to pass the CDL test?
Most states require 80% to pass the general knowledge test — typically at least 40 of 50 questions correct. Check your state's CDL manual for the exact passing score and any additional requirements.
How should I study for the CDL general knowledge test?
Read your state's CDL manual first, then take full practice tests like this one. Focus on the numbers examiners love to test — air pressure ranges, tread depths, stopping distances, and weight limits — and read every explanation to learn the reasoning behind each rule.
Is the CDL general knowledge test hard?
It is very passable with preparation. Most people who struggle either skipped the manual or memorized answers without understanding the rules. Practice tests that explain the why — not just the what — are the fastest way to get ready.