twobears, being a woman you'll see a lot more of this than the average Zed driver. Also, if Caroline's experience is anything to go by you'll get a lot of middle aged men in BMW's, Audi's, Range Rovers, etc, who will try to bully you by pushing in front of you and/or not letting you in the flow of traffic, in short they'll do anything to prove they are superior to you. Its just a man thing sadly.
Pete