Once you are south of Lyon (direction Marseille), you will have to take the exit to Tain l'Hermitage/Tournon. In Tournon is allready indicated the direction Lamastre. In Lamastre you go to Le Cheylard, but after 12 km you arrive in Nonieres. In this little village you go to the D241 direction St. Julien Labrousse/Chalencon. After 2 km you will arrive at a huge white cross. Next to it you see a small road to Les Costes.