my mum taught me when I was a teenager that when overtaking a cyclist, allow enough room for them to fall off next to you, without squashing their head. I have taken this with me throughout my driving career. I annoy other drivers by not overtaking until I can cross the white line, and giving myself enough stopping distance so if they fall off in front of me, I won't squash them. I demand space when I cycle, by riding in the middle of the lane, but on the odd occasion I don't, I still get punishment passes, so I'd rather give myself the room