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About CDL Pass Lab
CDL Pass Lab is a free study resource for U.S. truck, bus, and tank drivers preparing for any state's CDL knowledge exam.
Why we exist
The CDL knowledge exam is the gateway to one of the most important jobs in the country. America moves on commercial motor vehicles — food, fuel, medicine, building materials, finished goods, even people on transit and school buses. The drivers who keep all of that moving deserve high-quality study material that doesn't cost them a paycheck.
Most paid CDL test apps charge $25 to $60 for content that is, frankly, just rephrased from the official manual. We pull straight from the same source those apps use — the AAMVA Model Commercial Driver License Manual — and present it for free. Our only ask is that you let our advertisers fund the lights.
Where our questions come from
Every question on this site is based on the AAMVA Model Commercial Driver License Manual, maintained by the American Association of Motor Vehicle Administrators on behalf of the Federal Motor Carrier Safety Administration. AAMVA publishes this model manual so that every U.S. state DMV can issue a substantively identical CDL handbook. When you study from our questions, you are studying from the same source as the examiners writing your state's test.
For specific endorsements like Hazardous Materials, we also reference the Federal Motor Carrier Safety Regulations at 49 CFR Parts 100-185, which the H endorsement test uses directly.
What we are not
CDL Pass Lab is not affiliated with the FMCSA, AAMVA, or any state Department of Motor Vehicles. We do not issue Commercial Driver's Licenses, Commercial Learner's Permits, medical certificates, or TSA security threat assessments. For the actual license, you must go through your state's DMV (linked from each state hub page).
We also do not collect personal data from you. There is no signup and there is no account. The one exception: if you get a question wrong, your browser quietly remembers it — only in that browser's local storage, never sent to us or anyone else — so you can come back to My Missed Questions and drill just the ones you missed. Clear your browser's site data at any time and it's gone.
Found a question that's wrong?
The CDL rules change occasionally as FMCSA updates regulations and AAMVA refreshes the model manual. If you spot a question that contradicts your state's current handbook, please contact us and we'll review and update.