Which statement is true regarding Class D vehicles?

The classification of vehicles, particularly in the context of Maryland's licensing and inspection regulations, provides a specific framework for understanding what constitutes a Class D vehicle. Class D vehicles primarily refer to passenger vehicles, which generally include cars and light trucks, but they are not limited solely to passenger cars.

The correct understanding is that Class D vehicles encompass a broader range than just passenger cars; they may include other vehicle types, depending on their weight and use. This includes vehicles with configurations similar to Class B and C vehicles, which typically accommodate larger capacities and different purposes than standard passenger vehicles.

When considering the other options, it's clear that they do not fully capture the scope of what Class D vehicles represent. Notably, the classification does not restrict Class D to only vehicles under 10,000 lbs. GVWR or to motorcycles and trailers over 20 feet. Additionally, while passenger cars are a significant part of Class D, the definition also extends to other vehicle categories, reflecting a more comprehensive classification scheme.