I see this as a matter of courtesy in many cases. If @doppelkorn has enough time to slow to allow an indicating, waiting driver to turn, then somebody on a bike who zooms up behind him and blithely continues on has either completely failed to read the road ahead or they're just a rude, selfish cunt.
This. So much this.
I've been the stopper and the zoomer, I think we all have at some point.
This. So much this.
I've been the stopper and the zoomer, I think we all have at some point.