What characteristic defines a commercial motor vehicle?

A commercial motor vehicle is defined by its ability to operate on highways for commercial purposes, which encompasses activities related to transporting goods or passengers for pay. This definition aligns with regulations that classify vehicles based on their intended use, particularly in the context of commerce. Vehicles that fall within this category are typically larger, capable of carrying significant loads or numbers of passengers, and are subject to specific operational standards and regulations to ensure safety on public roads.

The option regarding exclusive design for private use does not apply, as commercial vehicles are specifically meant for business-related activities. Limiting the vehicle's use to intra-city environments does not reflect the full scope of commercial operation, which can frequently involve inter-city travel. Additionally, with advancements in technology, the expectation that commercial vehicles must be manually operated does not fully capture the evolving landscape of transportation, which includes automation and other innovations. The essence of a commercial motor vehicle lies firmly in its use for commerce on public highways, making it a crucial element in the logistics and transportation industry.