A number of studies show that fluorescent yellow-green is the preferred vest color for roadway visibility. Fluorescent orange-red is also an adequate safety garment color, according to this same study. However, the orange-red vest may tend to blend in with the surroundings when there is a lot of orange workzone machinery and equipment on the site. Wisconsin is one of a few states which provide yellowgreen safety clothing as an option for state employees exposed to traffic. Others include Minnesota, Michigan, Massachusetts, and Arizona.