On leaving Bourg Saint Pierre, follow the old road that climbs up to the Toules dam. The path continues along the left bank of the lake, then overlooks the Grand Saint Bernard Pass road. At L'Hospitalet, cross the road, then take the path that climbs up to the pass.
On the Italian side, the path resumes on the left side of the road: paved descent. The trail crosses the road twice more, then veers away from it to arrive gently at Saint Rhémy en Bosses. This magnificent little village is quiet and well away from the road.