For at least 5,000 years travellers have used the Ridgeway. The Ridgeway provided a reliable trading route to the Dorset coast and to the Wash in Norfolk. The high dry ground made travel easy and provided a measure of protection by giving traders a commanding view, warning against potential attacks. The Bronze Age saw the development of Uffington White Horse and the stone circle at Avebury. During the Iron Age, inhabitants took advantage of the high ground by building hillforts along the Ridgeway to help defend the trading route. Following the collapse of Roman authority in Western Europe, invading Saxon and Viking armies used it. In medieval times and later, the Ridgeway found use by drovers, moving their livestock from the West Country and Wales to markets in the Home Counties and London. Before the Enclosure Acts of 1750, the Ridgeway existed as an informal series of tracks across the chalk downs, chosen by travellers based on path conditions. Once enclosures started, the current path developed through the building of earth banks and the planting of hedges.