These components are body panels positioned over the wheels of large commercial vehicles. They serve to protect the vehicle, other road users, and the environment from debris, water, and other materials thrown up by the tires while in motion. An example is a curved piece of metal or composite material mounted above each wheel on a tractor-trailer.
The importance of these elements lies in their ability to enhance safety and compliance with regulations. They prevent road spray that can impair visibility for other drivers and reduce the risk of accidents. Moreover, they help keep the truck cleaner, safeguarding its appearance and potentially prolonging its lifespan. Historically, their design and materials have evolved alongside advancements in trucking technology, becoming more aerodynamic and durable.