The current hi-viz national standard, ANSI/ISEA-107-2010, was published in January 2010 as the American National Standard for High Visibility Safety Apparel. Guidelines include, but are not limited to, work wear, rainwear and safety vests.
A few decades ago, there was no national standard governing hi-viz apparel. Prior to 1999, people working in “low light” daytime conditions or at night were subject primarily to regulations drawn at the state level. Compliance with 50 different sets of regs led to both dangerous situations and high costs. Consistent national standards give workers and employers alike a firm foundation. They also establish a baseline for hi-viz garment manufacturers.