This happened to me several times this week - I'm in the right lane and I signal to turn right. I give at least 3 seconds warning before I brake (literally) and the whole time the person behind me is riding my ass. I figure they're going to turn right with me, but no, they keep going straight after I turn. I don't like making people brake unnecessarily (hence early warning) but at the same time I get pissed when somebody obviously doesn't know how to drive.
Left lane is not full.
Left lane is not full.