In physics blue shift is when the light waves from an object moving towards you are compressed, making it appear blue. This is a joke though, because blue shift has only been seen in stars and you would never be able to move fast enough in a car to cause it

I hate myself for not knowing this...Looks like Electromagnetics and Newton Physics they teach us at school are useless(impractical).Thank you for providing me with the explenation of that magnificent phenomenon...