as andyp said, road from Bourg d'Oisans is busy and a bit meh.. Recommend you head up towards alpe d'huez to the sixth hairpin bend and get on the balcony road.. This takes you towards Le Grave views are amazing and little traffic.. after col du lauteraut its a fast spectacular road to briançon. Good luck.
Waffle,
as andyp said, road from Bourg d'Oisans is busy and a bit meh.. Recommend you head up towards alpe d'huez to the sixth hairpin bend and get on the balcony road.. This takes you towards Le Grave views are amazing and little traffic.. after col du lauteraut its a fast spectacular road to briançon. Good luck.