[Lee Stewart]

The color is officially called 'national school bus glossy yellow,' and it's standard across the United States. Back in 1939, a conference funded by the Rockefeller Foundation attracted transportation officials from all-then 48 states, who came together and agreed on a number of safety standards for school buses, including the color. Yellow is very visible, even in early-morning or late-evening light, and black lettering on a yellow background is easy to read. It took until 1984 for all the school buses in the country to meet the standard