I generally pick my moments to change lanes when there is the most space, but no way am I going to wait for approval. Here, if I were to do that, I'd be still in that lane waiting! If you leave the indicator on too long people speed up.. What assholes, it makes no difference being one car behind.
So little things piss me off when driving, like not merging properly. I slow down a bit to give them a chance to merge but they hesitate and usually ends up with them not moving. Bah, just stupid. But it's not really road-rage, I get over it quickly and don't honk the horn or scream.
I am pretty calm, it takes ALOT for me to lose it. And I can't remember the last time I did. I get the most frustrated when people have really poor communication during a disagreement. I find it pointless.