The summit of Mont Ventoux is accessible by three roads - departing from Bédoin, Malaucène, and Sault - well known to cycling enthusiasts. The most accessible route starts from Sault by the departmental road or Route du Ventouret with 3,608 ft (1,100 m) of elevation gain and a slope of only 3.5%. The legendary ascent of the Tour de France starts from Bédoin, in the south, and has 5,321 ft (1,622 m) of elevation gain. 13.4 miles (21.6 km) long with slopes oscillating between 7.4 and 10%, this so-called Route de l'Observatoire was inaugurated in 1882. As for the northern side from Malaucène, it offers an elevation gain of 5,036 ft (1,535 m) with a slope of 7.5% by the 13 miles (21 km) long Route du Mont Serein inaugurated in 1932.