- School buses were previously painted traditional colors like black or brown.

- In the 1930s, the color yellow was proven to be the most visible color to the human eye.

- Dr. Frank Cyr did a comparative study and ultimately yellow was chosen.

Contrast:

- Yellow's high visibility comes from the way it stands out against other natural backgrounds, especially those commonly found near schools.

Design:

- School buses are also required to have reflective panels and flashing lights, which further increase their visibility.