This standard sets out requirements for the design, manufacture, and manner of erection of reflectorized accident prevention and guide signs for use in and about mines and tunnels. The standard defines as far as practicable, the types of sign to be used to indicate particular hazards which may cause accidents where such hazards cannot physically be removed, the directions to be followed, the location of exits and of safety and fire protection equipment, and information relative to safe practices.The standard does not apply to information signs of a general nature, such as plant, bulletin boards, safety posters, and the like. It is recommended, however, that such signs should not display a predominance of any of the accepted safety colours, viz red, yellow, blue and green.