let's not forget the ones who REALLY don't want anyone in front of them... you pull up and there's plenty of room for you to change lanes, so you signal, and then the guy that would be behind you after you finish changing lanes accelerates HARD to try to prevent you from merging over. i usually continue making my lane change anyway and ignore them. i can do that because there WAS enough room for me to merge without cutting them off, so they're using up that buffer when they accelerate for no other reason than being a D-bag. so it's their problem, not mine. and now that i have rear-facing cameras, i'll have proof if they try to road rage me.