Premise: Col du Glandon (1924 m ) is a high mountain pass in the Dauphiné Alps in Savoie, France, linking Le Bourg-d'Oisans to La Chambre. It is situated between the Belledonne, Grandes Rousses and Arvan-Villards mountain ranges, west of the Col de la Croix de Fer. The road over the Col du Glandon was opened in 1898, although it was not linked to the Col de la Croix de Fer until 1912.
Hypothesis: the col du glandon road in france linking Le Bourg-d'Oisans to La Chambre and Col de la Croix de Fer