What do the letters "D" in Class D inspection refer to?

The designation "D" in Class D inspection specifically refers to inspections for passenger vehicles. This classification is essential because it indicates that the inspection standards and criteria apply primarily to personal vehicles used for transporting people rather than commercial vehicles, motorcycles, or electric vehicles. Class D inspections cover aspects such as safety, emissions, and overall vehicle condition, ensuring that personal cars meet state regulations for safe operation on public roads. Understanding this classification helps in recognizing the scope and requirements for inspections specific to passenger vehicles as opposed to other types, such as commercial trucks or motorcycles, which would fall under different classes.