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).
The other color appearance parameters are colorfulness, chroma, saturation, lightness, and brightness. Usually, colors with the same hue are distinguished with adjectives referring to their lightness and/or colorfulness, such as with light blue, pastel blue, vivid blue.Exceptions include brown, which is a dark orange, and pink, a light red with reduced chroma.n painting color theory, a hue refers to a pure colorâone without tint or shade (added white or black pigment, respectively). A hue is an element of the color wheel.