what really rubs my rhubarb is when someone can't maintain a constant speed. They could be doing 60 but they want to do 50, fine. But then for some reason, they'll slow down to 45, then 50, then 40, 50, 45, 50... and so on. I get so annoyed I just overtake and plod at 60 only to have them catch me up and match me!! why didn't they just do 60 in the first place and be done with it? And why can they maintain a constant speed now I've over taken them? I just don't get it. And it's usually some ol'doddery git in a Honda Jazz.