Final answer:
A Commercial Driver's License (CDL) is necessary for operating vehicles with a GVWR of 26,001 pounds or more, ensuring drivers can handle large, heavy vehicles safely.
Step-by-step explanation:
You must have a Commercial Driver's License (CDL) to operate a single vehicle with a gross vehicle weight rating (GVWR) of 26,001 pounds or more. A CDL is required to drive larger, heavier vehicles, which typically includes commercial trucks and buses. This requirement is a standard set by the Department of Transportation and ensures that drivers have the necessary skills and knowledge to safely operate these large vehicles on public roads.