School buses are immediately recognizable and iconic. No matter how they change or get updated they have the same basic shape, color, design principals, and markings. As it turns out, back in the 1930s, they created an sort of ideal bus for carrying school children. It would be safe and that safety factor decided the rest of the design. The yellow color, so it would be recognizable, and the clear markings. The design worked so well the only major innovation to the bus is the automatic stop sign that drivers use to halt traffic so children can leave the bus safely. This is one of those interesting things that you always see but know nothing about. In this video, you can learn more about the iconic American school bus.