Mont Blanc Tunnel
Valle d'Aosta
The Mont Blanc Tunnel is an 11.6-kilometer-long motorway tunnel that links the Italian town of Courmayeur in the Aosta Valley with Chamonix in France's Haute-Savoie department. Constructed jointly by Italy and France, the tunnel was built between 1957 and 1965 and has since been one of the most important trans-Alpine transport routes. It consists of a single two-way tunnel with one lane in each direction, running beneath the Mont Blanc massif, with the tunnel passing under the Aiguille du Midi peak. The tunnel's altitude varies from 1,381 meters on the Italian side to 1,271 meters on the French side, with the highest point inside the tunnel reaching 1,395 meters. Its design includes a convex roadbed to facilitate water drainage. The tunnel has a width of 8 meters and a height of 5.9 meters. Safety measures include a speed limit of 70 km/h and a strict no-overtaking rule throughout the tunnel, especially after a major fire incident in 1999. Since reopening in 2002 following safety upgrades, the tunnel has been managed by a joint Italian-French group under governmental supervision. The Mont Blanc Tunnel remains a key artery for commerce and tourism between Italy and France, with an average daily traffic of nearly 5,000 vehicles. It is notable for its engineering achievement, passing under a thick granite layer and serving as a critical link in the European transport network.
Plan your trip to Italy with AI
Create a detailed itinerary in minutes. AI suggests the best places, restaurants, and an optimized route.
Tip: Visitors planning to drive through the Mont Blanc Tunnel should check current traffic conditions and possible closures in advance, especially during scheduled maintenance periods. It is advisable to respect the strict speed limit of 70 km/h and the no-overtaking rule for safety. Booking or planning trips during off-peak seasons can help avoid congestion. Although the tunnel is a transit route rather than a tourist attraction, travelers can enjoy the scenic mountain towns of Courmayeur and Chamonix at either end. Keep in mind that heavy vehicles have specific regulations and tolls. Advance information from the official website or traffic services is recommended for a smooth transit experience.
Interesting facts
- •The tunnel passes directly beneath the Aiguille du Midi peak, with a granite cover thickness of 2,480 meters, a record for road and rail tunnels.
- •At 11.6 kilometers, it was the longest road tunnel in the world at the time of its opening in 1965.
- •Since opening, approximately 70 million vehicles have passed through the tunnel, with an average daily traffic of nearly 5,000 vehicles in recent years.
- •The tunnel's roadbed is convex to allow efficient water drainage inside the tunnel.
- •The tunnel experienced a major fire in 1999 which led to significant safety improvements and a temporary closure until 2002.
History
Construction of the Mont Blanc Tunnel began in 1957 as a joint project between Italy and France to improve trans-Alpine transport.
The tunnel was completed in 1965 and opened to traffic shortly thereafter.
It was the longest road tunnel in the world at the time of opening.
On March 17, 1967, the tunnel celebrated its millionth vehicle transit.
In 1999, the tunnel suffered a devastating fire that led to significant safety upgrades and a temporary closure.
It reopened in 2002 with enhanced safety features and has been jointly managed since then by a binational organization.
Over the decades, the tunnel has become a vital transport corridor, facilitating economic and cultural exchange between the two countries.
Contact
Phone: 04 50 55 55 00
