CDL classes
Class A
Combination vehicles with a gross combination weight rating of 26,001 lb or more, where the towed unit is over 10,000 lb — for example, tractor-trailers and many tanker combinations.
Class B
Single vehicles of 26,001 lb or more, or towing 10,000 lb or less — for example, straight trucks, many dump trucks and some vacuum trucks.
Class C
Vehicles that don't meet A or B but carry 16+ passengers or placarded hazardous materials.
Common endorsements
- H — Hazardous materials (requires a TSA security threat assessment).
- N — Tank vehicles carrying liquids or gases in bulk.
- X — Combined tank and hazmat.
- T — Double/triple trailers.
- P — Passenger.
- S — School bus.
Which matter for energy transportation?
Liquid hauling generally involves tank vehicles, so the N endorsement is frequently requested. Hauling regulated hazardous materials requires H (or X when combined with tank). Specific job requirements depend on the employer, cargo and route — check each job posting.
Frequently asked questions
Can I drive a dump truck with a Class B?
Many straight dump trucks fall under Class B. A dump truck pulling a heavy trailer may require Class A.
What is the difference between N and X?
N covers tank vehicles. X combines tank and hazmat endorsements into one.