Abstract: A spray-suppressing surface configuration for mud flaps and other surfaces near the wheels of motor vehicles. Tapered finger-like projections are oriented in parallel with one another, projecting outward from a base surface at an angle a few degrees below the horizontal, when the base portion of the flap is vertical. The projections are arranged in a pattern of overlappingly adjacent rhombic groups arranged in parallel rows which define unobstructed channels for the flow of accumulated fluids received from the wheels of the vehicle, yet suppress splashing and formation of spray as fluid strikes a flap having such a surface configuration. At least the base surface and fingers may be of a flexible moldable material with an adhesion-resistant surface. Flexibility of the finger-like projections permits snow and ice to fall off the flap easily.