Why school buses are yellow

The professor of my current graduate course in Attention and Interpretation Therapies shared that instead of sitting behind a school bus cursing that it is holding up your morning commute, you could choose instead to bless the little children getting on the bus or wonder about why buses are yellow. Turns out, buses are yellow because yellow is the easiest color to see in low-light conditions. Moreover, the particular yellow-orange of school buses provides that best view of black lettering in low light conditions.

The color was chosen in 1939 as a standard during a conference on school bus standards. The color is now a federal law.


References
http://en.wikipedia.org/wiki/School_bus_yellow
http://www.colormatters.com/kids/yellow.html