Chartreuse (yellow-green) is the most visible color to the human eye
As you may recall just a few years back, road construction and maintenance crews wore florescent orange-red vest as a safety garment color. However the orange-red color tended to blend in with the orange workzone machinery and equipment. Instead of changing purchase orders to buy equipment in a color other than orange the "government" decided everyone working on the highway from construction people to police and fire department people would now wear the florescent yellow-green vest. This created an economic boost for China who supplied either the vests or the material to make the vest (made in the USA?) and created budget problems for small town and other organizations required to buy them.