About the standard
High visibility clothing is regulated in by the standards EN ISO 20471 and EN 1150. While EN 1150 only covers clothing for non-professional application like leisure activity the ISO 20471 standard covers high-visbility clothing for the professional and commercial requirements.
A high visibility vest according to ISO 20471 needs two horizontally surrounding reflective stripes with a minimum width of 50mm. It also requires vertical stripes.
ISO 20471 also has requirements for the color and luminous desnity after washing a piece at least 5 times.
Full wikipedia article: High-Visibility Clothing
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