mudflap

thumb|upright=1.35|Truck with bright blue mud flaps on the rear wheel wells and bumper.

A mudflap, mud guard, or rally flap is used in combination with the vehicle fender to protect the vehicle, passengers, other vehicles, and pedestrians from mud and other flying debris thrown into the air by a rotating tire on a wheeled vehicle. A mudflap is typically made from a flexible material such as rubber that is not easily damaged by contact with flying debris, the tire, or the road surface.