Which of the following vehicles is not required to have mudflaps?

Mudflaps are designed to prevent debris from being kicked up by the tires of a vehicle, which can be hazardous to other road users and can damage other vehicles. The requirement for mudflaps varies based on the type of vehicle and its intended use.

Pole trailers are typically specialized trailers that carry long loads such as logs or poles. Due to their specific design and the way they are used, these trailers often do not have the same mudflap regulations that apply to other vehicle types such as tractor trailers or box trucks. The function of pole trailers and the absence of a standard flat surface where mudflaps are typically mounted support the rationale behind this exemption.

In contrast, tractor trailers, flatbed trucks, and box trucks are designed for general transportation of goods and are usually required to have mudflaps to enhance safety and reduce road hazards. The regulations for these vehicles take into account their weight, design, and the potential risk they pose if debris were to be thrown from their tires.