The purpose of ANSI Class 3 safety vests is to permit optimum conspicuity and visibility for persons exposed to high vehicle speeds and / or reduced sight distances. The wearer must be able to be seen through a full range of body movements at a minimum distance of 1280 feet and must identifiable as a person. Examples of people who would use ANSI Class 3 safety vests may include flaggers, road construction crews, DOT crews, utility workers, survey crews. airport ground crews, law enforcement, railway workers, school crossing guards and toll gate personnel among others