: : I saw this bumper sticker the other day and I was wondering what exactly it meant. It was white with the red lettering, "If this sticker appears blue, you're goin too fast." I have been searching the web and have found little on this. If you could refer me to somewhere or explain what this concept is it would be greatly appreciated.

: : lol. That was funny. When a light source is approaching you the frequency of the light that you see is a higher frequency than it is being emitted. This aspect of the Doppler shift is called a blue shift. My god thats dumb