A relative lives in a cul de sac, so no through traffic. Very occasionally, someone's visitor or tradesman will park on the road, opposite her neighbour's drive. It doesn't actually block her exit/entrance, but it hampers her reversing in, which is her routine. It's a new build, and still within the first two years, so she eventually persuaded the builder to put a no parking sign on the grass verge opposite. There are no yellow lines, and neighbours have said that parking there can't be restricted. I suspect that the builder has no right to put a no parking sign there, but has done so anyway. I wonder if the sign will go walk about some dark night!