The Professional Truck Driver Institute is a non-profit organization that offers course certification for tractor-trailer driver training courses requiring basic and safe operations theory and behind the wheel training of commercial 18-wheeler tractor-trailer combinations. The certification courses offered by both private and publicly funded schools and require written and driving tests (skills and competency testing). Upon passing exams with the Department of Transportation, both State, and Federally regulated in the US, the successful candidate received a Class-A CDL, (Commercial Driver's License), formerly known as a Chauffeur's license.