On the other hand, the yellow dot shows the lightest spot on the tire. Yes, tires aren't perfectly balanced when they come from the factory, and that's exactly what these dots are meant to help with.

There are a few reasons why the colors red, yellow, and green were chosen for traffic lights. Red is an obvious choice. The color red means danger or to be alert for something occurring.

Talking Transportation Why traffic signals are red, yellow, green — and expensive The first traffic signals were not always the colors you see now. Here’s some history.