with the D1091 to the east of Le Freney-d'Oisans. From here, the road is 12.8 km 1 abbr=on km long, climbing 954 m at an average of 7.5%, although the first kilometre to Mizoën has a gradient of 11.5% and the maximum gradient is 13.5% at 3 km 1 abbr=on from the summit.

The passage over the summit was used in the 2013 Tour de France; following that race, German rider Tony Martin criticized the decision of the Tour de France organisers to use