What is the purpose of a commercial driver's license?

The purpose of a commercial driver's license (CDL) is to permit the operation of commercial vehicles, which includes large trucks, buses, and vehicles designed to transport hazardous materials or a significant number of passengers. A CDL is necessary because driving these types of vehicles can involve different regulations and safety requirements compared to standard passenger vehicles.

The requirements to obtain a CDL ensure that drivers have received the proper training and have demonstrated proficiency in operating larger and more complex vehicles, which can pose greater risks on the road if not handled correctly. This is essential for maintaining safety on the highways and ensuring that the drivers are equipped to manage the unique challenges of commercial driving, such as larger blind spots, different braking distances, and specific handling characteristics that differ from standard cars.

The other options do not accurately reflect the primary role of a commercial driver's license. For example, a CDL does not allow the operation of passenger vehicles or regulate private vehicle operation, nor does it restrict driving to specific hours, which are generally governed by other regulations and laws.