Safety orange (also known as blaze orange, vivid orange, OSHA orange, hunter orange, or Caltrans orange) is a hue. Safety orange is used to set objects apart from their surroundings, particularly in complementary contrast to the azure color of the sky. (Azure is the complementary color of orange, and thus there is a stark contrast between the two colors.) The high-visibility color is commonly used for hunting during the rifle season, and is also used for upland-bird hunting. Places such as construction sites use this orange to help ensure the safety of others.