What is required for a motor vehicle to qualify as a commercial motor vehicle?

For a motor vehicle to qualify as a commercial motor vehicle, it must primarily be used for commercial transportation. This means that it is utilized in the operation of a business or for profit-generating activities rather than for personal or recreational use. The definition emphasizes the vehicle’s intended use rather than specific modifications, registration status, or limitations to transporting passengers alone.

While the other choices may touch on relevant aspects of vehicle classification, they do not fully encompass the primary criterion which is centered on the vehicle's predominant purpose in commercial activities. The fundamental distinction lies in its primary use for commercial purposes, which serves as the key determinant in its classification as a commercial motor vehicle.