Several times this week i have encountered this, usually elderly ladies or those with young children in the back of the car.
I don't understand it surely they should know better, or is it just sod you i've got a car so sod everyone else who have to walk!! I'm sure it's law that you have to stop if there is someone waiting and yes i have given hand signals to some of them, this really riles me up, i don't care what rush there in they should leave sooner and it's just so selfish. I get really annoyed with people parking on the paths too!! so i have to walk myself and pushchair and small child onto the road to get through ARRRRRHHHHHH RANT OVER!!!