Premium car rental company, Avis, has created the Avis Driving Ratio (ADR) to solve one of the longest running debates amongst car enthusiasts and determine once and for all which is the UK’s best driving road. When applied to three UK roads which are often cited by motoring forums, car clubs and the media as the nation’s best due to their stunning locations and challenging drives, the Avis Driving Ratio (ADR) identifies the A591 from Kendal to Keswick in the Lake District as the nation’s best driving road.