Like running, it can take place on a track or as a road race. The main competitions take place at the Summer Paralympics which wheelchair racing and athletics has been a part of since 1960. Competitors compete in specialized wheelchairs which allow the athletes to reach speeds of 30 km/h or more.
Hue is one of the main properties (called color appearance parameters) of a color, defined technically (in the CIECAM02 model), as the degree to which a stimulus can be described as similar to or different from stimuli that are described as red, green, blue, and yellow  (the unique hues).
Color - Additional terms. 1  Color wheel: an illustrative organization of color hues in a circle that shows relationships. 2  Colorfulness, chroma, purity, or saturation: how intense or concentrated a color is. 3  Dichromatism: a phenomenon where the hue is dependent on concentration and thickness of the absorbing substance.