This standard specifies performance requirements for high-visibility safety apparel (HVSA) and personal protective clothing accessory (PPE). The purpose of this standard is to provide conspicuity to the user in dangerous situations under any light conditions by day and under illumination by vehicle headlights in the dark or other low light conditions for professionals. Performance requirements are included for color, retroreflection, and minimum areas of retroreflective and combined-performance materials, as well as the recommended configuration of the materials. It also provided for the color, physical properties, and minimum areas of background materials used in the construction of HVSA and accessories. NOTE: For further information concerning risk situations, check standard in clause (2.1) Annex A.