Yellow is for School Bus

The National Highway Traffic and Safety Administration recommends that school buses be painted National School Bus Glossy Yellow. The wavelength of the popular school-bus color is “right smack in the middle” of the peak wavelengths that stimulate the photoreceptor cells our eyes use to perceive red and green.  You get double the amount of transmission to the brain. Remarkably, “That color that we are calling school bus yellow hits both peaks equally.” So it is hard for drivers to miss a school bus, even in their peripheral vision. https://www.smithsonianmag.com/history/history-how-school-buses-became-yellow-180973041/