This Standard specifies the optical performance requirements for high-visibilty clothing to be worn by adults and by juveniles, and designed for non-professional use. High-visibility clothing for non-professional use is intended to signal the user's presence visually in any daylight condition and, when illuminated by vehicle headlights or search lights in the dark as well as lit up in urban roads. This standard is not applicable to accessories to be carried by persons or attached to garments.