Remember this: No matter how crazy that "other" driver behaves on the road, do NOT react, speak, gesture, take any kind of defensive action, or even have eye contact with the aggressor. Law enforcement advises avoiding conflict altogether. If you can, pull over safely and let the aggressor go by. You may have to swallow your pride, anger, and sense of injustice, but it is not worth getting into a fight or worse. Let it go!