We normally seem to do this one going north, don't know why. I think going south (downhill is better). From Briançon up to just before the Col du Lautaret is a fast main road. It's one of the main routes out of Grenoble and can be really busy at times, however, casino online it is wide and most bikes'll have little trouble polishing off the traffic if you get stuck in a convoy. Off-peak then just get that knee down on the ton-up sweepers. The final section is particularly good, Long, wide curves, some through galleries, and very fast, just before the turn-off to the Galibier