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Your complete guide to ANSI/ISEA 107 high-visibility classifications — and how to choose the right gear for your worksite. - Download Document  Why Hi-Vis Classification Matters If you work near traffic, heavy machinery, or in low-light conditions, high-visibility (hi-vis) clothing isn't just a good idea, in many cases, it's the law. The ANSI/ISEA 107 standard defines specific classes of high-visibility safety apparel, and OSHA references this standard in its requirements for workers …