The town of Chamonix is served by French Route Nationale 205 (RN 205), nicknamed the Route blanche, or white route, due to its snowiness. This is an extension of French autoroute 40 (A40), similarly nicknamed the autoroute blanche, which ends at Le Fayet, a village in the commune of Saint-Gervais-les-Bains. The 11.6-km Mont Blanc Tunnel originates here, linking Chamonix to Courmayeur in Italy. Chamonix is linked to Switzerland by what used to be RN 506a. In 2006, it was converted to a Route Départementale 1506, with a part of it integrated into RN 205.