Road signs in the UK are a design classic, the work of graphic designers Jock Kinneir and Margaret Calvert. They've been around over fifty years but still look crisp and modern. Apparently the one warning of the presence of farm animals was inspired by a cow called Primrose. And the bossy little girl leading a boy on the school sign was considered daring in the '60s. Sexual equality hadn't quite made its mark so the male of the species should have been the one in front.
This one has always puzzled me. Its meaning makes perfect sense, warning of potentially treacherous road surfaces. There's a lot of these posted around the winding muddy Devon lanes. But how could you ever get a normal car to make tyre tracks like that?