Route National from Bourg St Maurice to Moutiers is dangerous. Bike lanes badly maintained and lots of HGVs. Best to take the balcony road shown on the main page or the train service to Moutiers.
Be careful not to be led onto the motorway at Moutiers and avoid the road that goes by the factories, lots of railway crossings that are badly maintained.

Damaged a rear wheel on a pothole in the cycle lane after Aime and blew out a rear tire. Luckily the bike shop in Moutiers was open and changed the tire. Had to walk 5km to Moutiers!