"School Bus Yellow" is a color specifically designed for school buses because of its high visibility.
In 1939, Columbia University professor Frank W. Cyr organized a conference to create school bus construction standards, including the color. Paint experts from DuPont and Pittsburgh Paints created a shade of yellow that provided the greatest visibility in the semi-darkness of early morning. They chose the obvious name of "school bus yellow."
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And still people tell the officer, "I didn't see it." after the have backed into me, or run into the back of the bus.
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Science marches on. There are much more visible colors available now; look at any cyclist or road worker.
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