What does CDL stand for?

The abbreviation CDL stands for Commercial Driver's License. This is a specific license required in the United States for individuals who drive larger vehicles, such as buses or trucks, that fall under certain weight and size classifications. The CDL is essential for operating commercial motor vehicles safely and legally, and it ensures that drivers meet specific federal and state standards in terms of knowledge and skills related to driving these vehicles.

The other options do not accurately reflect the official designation used by authorities for the license required to operate commercial vehicles. The Certified Driving Learner and Certified Driver's License are not recognized terms in the context of commercial vehicle operation, while Commercial Driving License, while similar, is not the standard terminology used. Therefore, the correct answer is that CDL stands for Commercial Driver's License.