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Free CDL practice tests

Practice for the written (knowledge) tests of the commercial driver's license. Every question is written from the Pennsylvania Commercial Driver's Manual (PUB 223), May 2026 edition, and every answer shows the exact rule and the page it comes from. Most states publish their CDL manual from the same national model, so the knowledge tests cover the same material — but check your own state's manual for state rules.

• General knowledge
  79 questions · 3 tests
• Air brakes
  27 questions
• Combination vehicles
  21 questions
• Hazardous materials
  24 questions
• Doubles and triples
  14 questions

Which CDL tests do you need?

Everyone takes general knowledge. Add air brakes to drive a vehicle with air brakes (otherwise the license carries an air brake restriction) and combination vehicles for a Class A license. Endorsements have their own tests: H hazardous materials, N tank vehicles, P passenger, S school bus, T double and triple trailers.