Several fundraising bike rides take place between London and Brighton each year. The most famous is the British Heart Foundation event which has taken place each summer since 1976, and in 2014 involved an estimated 30,000 riders. The event starts on Clapham Common and the 54 mile route finishes on Madeira Drive in Brighton. Despite most roads being closed to cars, the number of bikes is such that traffic jams occur, especially at hills. The toughest part of the route is the climb over Ditchling Beacon which once featured in the Le Tour de France; having already cycled some , cyclists must then tackle a climb with an average grade exceeding 1 in 10. Several sections are somewhat steeper, and whilst the fittest will try to cycle up, the vast majority will walk.