 Loads on two-wheeled carts had to be constantly shifted to the back during descents and to the front during ascents so that the animals could draw efficiently.In medieval and later times ridgeways in England were used as drovers roads.Since ridgeways were informal routes, and the rounded tops of many British and German ridges might be hundreds of metres wide, the track might change seasonally, or spontaneously, if any land alongside the trail appeared drier and firmer.