School buses aren't yellow by accident: 44 standards came from a seven-day 1939 Columbia conference, and the color stimulates two types of cone cells

A 1939 meeting established the distinctive school bus yellow color for national transportation standards. This specific shade, National School Bus Chrome, was chosen after extensive deliberation among educators and experts. Scientific studies later confirmed that this yellow hue effectively stimulates both red and green cone photoreceptors in the human eye. This color choice enhances visibility, particularly in peripheral vision, contributing to student safety on roads.