I deal with it every day too. This morning some idiot in an SUV made an aggressive move cutting me off to pass a car. As soon as he got beside the car, he slowed down to make a rolling road block. But those are the times I'm glad I'm on the bike. Legal or not, I got past his road block and watched the gap in traffic get bigger and bigger. And the lady that tried to change lanes on top of me coming home actually heard the stock horn, believe it or not. I was already taking evasive manuvers in case she didn't and kept coming. I won't let the selfish inconsiderate cagers control what I commute on.