In high traffic areas, don't ride two (or more) abreast (unless the lane is too narrow to allow safe passage). And ride as far to the right as you safely can. But sometimes, this means that you need to take the whole lane and make people behind you wait until you can move safely to the right.

I try and be easy to predict and ride in such a way that I don't slow down cars more than necessary. And where I am, most cars have no problems with this.

Cheers,
Charles