Wrecking of verges is very annoying. The local school bus turns around in a side road by our small holding and half the time they get it wrong, mount the curb and onto the grass verge and trash it.
But up a lane near here there is a grass verge with no curb in a tight, twisty section of road that has rocks on it. It is in a location where a situation like sharkbait describes is very likely to happen. Fortunately we know they are there, i am sure plenty of people have not been, nor will be so fortunate.
But then to counter that if the rocks were not there I am sure more people would go on the grass and smear more mud on the road.