The Col du Jandri is a high mountain pass at an elevation of 3.165m (10,383ft) above the sea level, located in Rhone-Alpes in the French Isère département. It follows the R1-2 trail. It's one of the highest roads of Europe. This runway forms the highest trafficable road in the Alps and includes very steep ramps.
The road is not paved but passable by all-terrain vehicle. The track still stands winding, often stony, dusty and steep. The road is signposted as mountain bike cross-country course and is even used by motorized heavy vehicles. The way has some very steep ramps. You have to challenge some very steep grades which require both physical strength and a very low gear.
To get the summit, starting from Les Clapiers (Le Bourg-dOisans), the ascent is 26.9 km long. Over this distance, the elevation gain is 2.458 meters and the average percentage is 9.1 %. The road is asphalted to 1.730 m altitude, just above the highest houses on the side. Then the gravel road is good enough for cycling with a road bike on, but it is still quite steep and very dusty. It's one of the highest roads of the country.
This road is usually open throughout the summer. A panoramic restaurant is situated there at an elevation of 3,200 meters and provides amazing views to the Glacier Mont de Lans. Do not travel this pass in severe weather conditions. Avalanches, heavy snowfalls and landslides can occur anytime, being extremely dangerous due to frequent patches of ice. It has a well-deserved reputation for being dangerous because of unpredictable snowstorms and blizzards, and driving under these conditions, can be extremely challenging. Before this pass, the road climbs up the Col des Gourses, at an elevation of 2.565m (8,415ft) above the sea level.
The surface on this gravel road is often loose, especially along the sides of the road. Due its unique location and the climb in elevation over thousands of feet, and passing through remote areas, it is important when driving in these conditions to be prepared.