Riding around Bourg d'Oisans

[wildeman]

Going to Bourg d'Oisans this summer for some riding. Was wondering about doing the loop from town up over the Glandon/col de la Croix, down to St. Jean de Maurienne. Then down the Valley to St Michael and up the Telegraph and Galibier and back to Bourg. About 145 kilometers and about 3500 meters of climbing. My questions are about navigating the roads between St Jean and St Michael. Are there alternate roads besides the throughfare? easy to find and navigate? How about the main road from the Galibier back to Bourg? I see it has several tunnels, are they safe with the traffic?
Any other tips about this loop? Thanks