Define "commercial motor vehicle" according to Massachusetts law.

The correct definition of "commercial motor vehicle" according to Massachusetts law includes vehicles designed to transport more than 16 occupants, which encompasses both passengers and the driver. This definition aligns with the federal standards for commercial vehicles, which highlight the significance of such vehicles in public transportation and commercial activities.

This classification is important as it ensures that vehicles that carry a larger number of passengers are subject to more stringent safety and operational regulations to protect both occupants and the general public. By specifying the number of occupants, the law aims to address the unique risks involved with larger vehicles, thus necessitating different licensing, insurance, and safety protocols.

The other options provided do not fully encapsulate the definition as mandated by law. For instance, a vehicle designed solely for transporting goods does not address the passenger capacity aspect, while personal transport vehicles are excluded from this definition. Additionally, the weight limit alone, without consideration of occupant capacity, does not fit the comprehensive legal definition. Thus, the nuanced understanding of passenger capacity within commercial vehicle classifications is fundamental to recognizing and adhering to the statutory requirements in Massachusetts.