EN 20471 (original standard EN 471) - High visibility warning clothing for professional use - Testing methods and requirements
Requirements for clothing that is able to visually signal the presence of the user. This clothing is intended to cause good visibility of the user in dangerous situations, both in any lighting conditions during the day and when illuminated by the front lights of the means of transport in the dark.
It includes qualitative requirements for colour and retro-reflective materials of protective clothing, their arrangement and minimum surface area.
Minimum required areas of conspicuous material in m² (background material, retroreflective material, material with combined properties):
Clothing class 1, 2, 3
Minimum retroflexion coefficient for material with a single property, class 2 (applies to reflective stripes).