Which of the following vehicles typically requires a "Class B" CDL?

A "Class B" Commercial Driver's License (CDL) is required to operate single unit vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more. This category encompasses vehicles such as large buses, box trucks, and certain types of delivery trucks, which are used extensively in commercial transport. The licensing requirement is in place to ensure that drivers have the skills and knowledge to handle larger, heavier vehicles safely, considering their impact on traffic and road safety.

The other options do not meet the criteria for a Class B CDL. Combination vehicles typically require a "Class A" CDL because they involve towing trailers or other vehicles that would increase the total weight and complexity of driving. Motorcycles over 500cc generally require a motorcycle endorsement rather than a CDL. Light-duty vehicles with tow capabilities are usually classified under standard driver licenses and do not necessitate a commercial license unless they exceed specific weight thresholds or are configured in a particular way that categorizes them as commercial vehicles.