What is the definition of a semitrailer?

A semitrailer is defined as a vehicle that is designed without its own motive power and is intended to be used in conjunction with a motor vehicle, usually a truck or tractor. This type of trailer is designed to be attached to the towing vehicle in such a way that a portion of its weight is supported by the vehicle itself, allowing for efficient load distribution and increased capacity.

This definition emphasizes that the semitrailer cannot operate independently; it relies on the motor vehicle for propulsion and maneuverability. Understanding this characteristic is crucial, as it differentiates semitrailers from other vehicles that can operate on their own, such as full-sized trucks or independent trailers that can be towed without a specific vehicle.

In contrast, other options highlight characteristics that do not accurately apply to semitrailers. For instance, a vehicle designed to be fully motorized does not fit the definition of a semitrailer, as it lacks the essential feature of being towable by another vehicle. Similarly, vehicles that operate independently or are primarily used for transporting people do not align with the purpose and design of a semitrailer, which is specifically for carrying cargo in conjunction with a motor vehicle.