Closure of the Mont Blanc tunnel

The cases

The Mont Blanc tunnel will be closed for major maintenance works.

The Tmb-Geie company, which manages the operation of Mont Blanc Tunnel, announced a total closure of the road tunnel from September 2 to December 16, 2024. This is an inevitable closure to carry out maintenance work of large sections of the road deck and the ceiling, which will allow two 300m sections of the tunnel to be renovated.

The work was planned originally to be carried out in 2023 but had to be delayed following the landslide on the A43 at Maurienne. During the works, no vehicles will be allowed to pass through the tunnel for fifteen consecutive weeks, specifically from 5 PM on September 2 to 5 PM on December 16, 2024. A second phase of interventions is planned for 2025 over an additional 600 meters.

The Mont Blanc tunnel, which is 11.6 kilometres long, consists of a single gallery with two-way traffic that connects Courmayeur, in Valle d’Aosta, to Chamonix, in the French department of Haute-Savoie. It represents one of the most important road links between France and Italy, with a significant percentage of Italy’s exports being transported by truck through this link. Its closure to traffic will have important direct effects on the transport system and on the entire export sector, causing serious disruptions in circulation of heavy vehicles between Italy and France, but these works serve to maintain and enhance the structural integrity of the tunnel roadway, ensuring safety and reliability for all users.

The closure period was jointly established by the Prefectures of Valle d'Aosta and Haute-Savoie. The alternative routes to the tunnel are: the Great St Bernard tunnel to go to Switzerland or to the French areas bordering Switzerland, and the Frejus tunnel to go to the south-east side of Mont Blanc.