The three CDL classes
Your license class decides what you can drive. Most new drivers aiming at tractor-trailer work go straight for Class A.
- Class A
- Combination vehicles with a gross combination weight rating of 26,001 pounds or more, where the towed unit is heavier than 10,000 pounds. Tractor-trailers live here, and it's the most flexible license to hold.
- Class B
- Single vehicles rated 26,001 pounds or more (or towing a unit under 10,000 pounds). Think dump trucks, box trucks, buses, and straight trucks.
- Class C
- Smaller commercial vehicles that don't meet A or B but carry 16 or more people including the driver, or placarded hazardous materials.
Endorsements (like hazmat, tanker, passenger, school bus, or doubles/triples) add specific privileges on top of your class, each with its own knowledge test — and for hazmat, a TSA security threat assessment.
The seven-step path
Decide if trucking fits your life
Look honestly at schedules (local, regional, over-the-road), time away from home, and physical demands before spending money. The Bureau of Labor Statistics publishes current pay and job-outlook data for heavy and tractor-trailer drivers — use that, not recruiting ads, to set expectations.
Check the basic requirements
Federally, you must generally be at least 21 to drive a commercial vehicle across state lines (interstate); many states issue intrastate-only CDLs at 18. You'll need a regular driver's license, a clean enough driving record for employers, and the ability to pass a DOT medical exam.
Pass the DOT medical exam
A certified medical examiner listed in FMCSA's National Registry performs the exam and issues your medical certificate. Most states require it before or alongside your permit application, so schedule it early.
Get your Commercial Learner's Permit (CLP)
Study your state's CDL manual and pass the knowledge tests at your licensing agency. Under federal rules you must hold the CLP for at least 14 days before taking the skills test, and you can only drive with a qualified CDL holder beside you.
Complete Entry-Level Driver Training (ELDT)
Since February 7, 2022, first-time Class A or Class B applicants (and drivers upgrading or adding hazmat, passenger, or school bus endorsements) must complete training from a provider listed in FMCSA's Training Provider Registry before taking the skills test or hazmat knowledge test.
Pass the three-part skills test
The skills test covers vehicle inspection, basic control, and an on-road drive, taken in the class of vehicle you want to be licensed for. Your training provider or school usually helps schedule it.
Get hired and finish strong
Many carriers hire new graduates into paid training or mentorship programs. Expect a pre-employment Clearinghouse query and drug test. Endorsements like tanker or hazmat can widen your options once you're settled.
Where to go next
Comparing training programs? Start with Find CDL Schools. Ready to study? The Practice Tests guide breaks down every knowledge-test module.
