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Our network

The Autoroute Blanche (A40): a vital route for Haute-Savoie

The A40 connects Mâcon (Saône-et-Loire) to Le Fayet (Haute-Savoie). ATMB is the licencee of the section going from Châtillon-en-Michaille (Ain) to Le Fayet (Haute-Savoie). 110 km long, it branches off in two directions going towards Switzerland (A41 and A411). APRR manages the Mâcon-Châtillon-en-Michaille section.

The Autoroute Blanche (A40) was constructed to meet the touristic and industrial growth in the Arve Valley, to coincide with the opening of the Mont Blanc Tunnel, as well as the Haute-Savoie residents’ growing needs for increasing mobility. The first section, connecting Geneva-Vallard to Bonneville, was inaugurated in 1974. The last in 1991.

Located at the foot of Mont Blanc, ATMB manages the 110 km Autoroute Blanche (A40), which contains more than 200 structures, including 3 viaducts (Bellegarde, 1050 m; Bois d’Arlod, 300 m; Bardonnex, 360 m) and a tunnel (Vuache, 1.4 km).

More than 200 towns in Haute-Savoie and Ain are connected by the Autoroute Blanche (A40). A vital artery for Haute-Savoie, it has thirteen interchanges to meet the needs of a densely populated and economically active area.

The A40 is also a favorite route to the mountain resorts of Haute-Savoie. Whether winter or summer, tens of thousands of holiday-makers all take this route to the areas of Mont Blanc, Aravis, Giffre, Chablais and Beaufortain, which is served by the ATMB network.

The vast majority (nearly 90%) of traffic on the Autoroute Blanche (A40) consists of light vehicles.

30 municipalities served, 13 interchanges, more than 200 structures, 3 viaducts and a Tunnel.

Click here to view the map of the Autoroute Blanche (A40)

Route Blanche (RN205): the route to Chamonix and the Mont Blanc Tunnel

From Le Fayet, the Route Blanche (RN205) is the link going from the Autoroute Blanche (A40) to reach Chamonix and the Mont Blanc Tunnel.

20 km long, the Route Blanche (RN205) is a toll-free national expressway without tolls. This route pathway is essential to serve the communities of the Chamonix valley. The RN205 is also the preferred way to reach the Aosta Valley in Italy, through the Mont Blanc Tunnel. Since 2010, the state has entrusted ATMB with operating and maintaining the Route Blanche (RN205).

The Route Blanche rises 1274 m above sea level and has 53 bridges and viaducts (including the Egratz, 1,470 m long and 68 m high) and three tunnels (including the Chavants, 1,015 m long) over only a 20 km stretch. It is exposed to freezing temperatures for over 100 days a year.

ATMB has set a goal to bring a level of security and service to this route pathway on a par with that of the Autoroute Blanche (A40).

53 bridges and viaducts over 20 km

Did you know?
On Saturdays during February vacations, the ATMB teams handle as many as 80,000 vehicles on the Autoroute Blanche going to the ski resorts. On the Autoroute and the Route Blanches, winter service lasts half the year! More than 40 vehicles and 170 people were mobilized to clear snow from 130 kms of road.