CDL Practice Tests
Commercial Driver's License practice for every state and endorsement.
Source: FMCSA Commercial Driver's License Manual (public domain) plus state-specific supplements.Practice tests
General Knowledge
Practice mode with explanations, or full mock exam — 50 questions, 80% to pass.
25 questions per testAir Brakes
Practice mode with explanations, or full mock exam — 25 questions, 80% to pass.
20 questions per testCombination Vehicles
Practice mode with explanations, or full mock exam — 20 questions, 80% to pass.
30 questions per testHazardous Materials
Practice mode with explanations, or full mock exam — 30 questions, 80% to pass.
20 questions per testTanker
Practice mode with explanations, or full mock exam — 20 questions, 80% to pass.
20 questions per testDoubles and Triples
Practice mode with explanations, or full mock exam — 20 questions, 80% to pass.
20 questions per testPassenger Transport
Practice mode with explanations, or full mock exam — 20 questions, 80% to pass.
20 questions per testSchool Bus
Practice mode with explanations, or full mock exam — 20 questions, 80% to pass.
Practice by state
Each state DMV uses slightly different rules and procedures. Practice with state-specific notes by selecting your state below.
About the CDL exam
Practice tests for the Commercial Driver's License written exam. Questions reflect the Federal Motor Carrier Safety Administration (FMCSA) Commercial Driver's License Manual that all states adopt as the basis for their CDL exams.
Teachers and trainers preparing students for CDL exams can find supporting lesson plans and teaching resources at LessonKind. For reference data on road weights, distances and measurements, 247Sizing is a handy companion.
How we built these practice tests
Every question in our CDL bank was written by the 247SimpleTests Editorial Team using the current version of FMCSA Commercial Driver's License Manual (public domain) plus state-specific supplements.. We do not scrape questions from other test-prep sites; we write originals that test the same knowledge in different language. Each question lists the source section it was drawn from. Full methodology →
Recommended study materials
CDL Study Guide 2025–2026 (Trivium)
Complete prep for all CDL written tests: general knowledge, air brakes, combination vehicles, hazmat, and all endorsements. Includes full-length practice tests.
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Check Price → Study guideMaster the CDL Truck Driver's License (Arco)
Arco's classic CDL prep with in-depth FMCSA manual coverage, endorsement chapters, and scored practice exams.
Check Price →As an Amazon Associate, CJ Affiliate, and AWIN publisher we earn from qualifying purchases. Links above are affiliate links. Full disclosure →
Practice test FAQs
Is the CDL practice test free?
Yes. All 205 practice questions across every CDL topic are free, with no sign-up, account, or payment required.
How many CDL practice questions are there in total?
This section has 205 original practice questions across 8 topic areas, each with a full explanation written by our editorial team.
Does CDL practice cover my state?
Yes — select your state above for state-specific notes alongside the core practice questions, which are written from the applicable official handbook or manual.
Is there a study guide for the CDL exam?
Yes, see our CDL exam guide for the test format, scoring, what is covered, and study tips.
Do the CDL practice questions include answer explanations?
Yes. Every question includes a detailed explanation of the correct answer, so you learn the underlying material rather than memorizing answers.