Which of the following is required to drive a commercial motor vehicle?

To operate a commercial motor vehicle, a commercial driver's license (CDL) is mandatory. This requirement ensures that the driver has received the appropriate training and has demonstrated the necessary skills and knowledge to safely operate larger and more complex vehicles, which can include trucks and buses. The regulations regarding obtaining a CDL include passing written tests and practical driving assessments that focus on the unique challenges associated with commercial driving, such as handling larger vehicles, understanding federal and state regulations, and ensuring safety on the roads.

While a valid personal driver's license, a medical examination, and a special skills test may all be important components in the broader context of driving or operating vehicles, they do not independently qualify someone to drive a commercial vehicle. The core requirement for commercial operation is the possession of a CDL. This ensures that those driving commercial vehicles are equipped with the essential skills to manage the demands of such transportation effectively and safely.