<Tr> <Td_colspan="2"> B: Normalized to (0--255) (byte) H: Normalized to (0--100) (hundred) </Td> </Tr> <P> School bus yellow is a color which was especially formulated for use on school buses in North America in 1939 . The color is now officially known in Canada and the U.S. as National School Bus Glossy Yellow and was originally called National School Bus Chrome . The pigment used for this color was, for a long time, the lead - containing chrome yellow . </P> <P> The color was chosen because it attracts attention and is noticed quickly in peripheral vision, faster than any other color . Scientists describe this as follows: "Lateral peripheral vision for detecting yellows is 1.24 times greater than for red ." </P> <P> In April 1939, Dr. Frank W. Cyr, a professor at Teachers College, Columbia University in New York organized a conference that established national school - bus construction standards for the U.S., including the standard color of yellow for the school bus . It became known officially as "National School Bus Chrome". The color was selected because black lettering on that hue was easiest to see in the semi-darkness of early morning . </P>

Why the colour of school buses is yellow