How the yellow school bus became an iconic symbol in America

They arrived in a kaleidoscope of colors, but one won. For decades, the American school bus has maintained such a standard look that “school bus yellow” is national shorthand for its deep, glossy hue. No act of Congress mandated the color, with its slight orange tint. Rather, a 1939 conference of transportation officials from all U.S. states (then 48) chose the shade for its visibility as one of the first safety standards. At their peak in the 1980s, the yellow buses took more than 60% of U.S...