As I ride my bike in traffic, I tend to forget I am on a bike. I merge in with cars, turn across lanes to make a left turn, and in general move around like a car would. Sometimes I take it for granted that the car drivers see me. I also may cut in behind cars closer than cars may think is a good idea.
As I thought about this the other day I realized that the cars have no idea what I am doing unless I signal well (which I usually do - but not always - making a sharp cut across traffic to fit between cars is not always a good idea with only one hand on the bars!).
I thought about this more after a friend sent me this link. And it made me think: What does my riding look like to the cars out there? What do the car drivers think? See this link below - I can definitely see how cars can come to hate cyclists after viewing this.