dealing with cops is the same as dealing with women - if you project the right image you will get the right treatment.
the image you want to project is that you are a respectable person who is in no way angry about being pulled over - quite the contrary - you are enjoying a pleasant conversation - because ( without saying so ) you know your lawyers will get you out of any trouble so you have absolutely nothing to worry about and are happy to have a nice chat.
by contrast when a nigger gets pulled over he immediately begins to project the " i need to be shot " vibe ...