Great St. Bernard Tunnel: night-time closures and alternating traffic in 2026
The operator of the Great St. Bernard Tunnel (Sitrasb SpA) has confirmed that night-time renovation works related to the replacement of the ventilation slab will continue in 2026. The works will involve temporary closures and alternating one-way traffic and may affect route planning in international transport between Italy, Switzerland and France.
The works will be carried out exclusively at night, from 22:00 to 06:00. No works are scheduled on Friday–Saturday and Saturday–Sunday nights, in order to limit disruptions to daytime and tourist traffic. During the works, alternating one-way traffic (senso unico alternato) will be in place at the tunnel entrances, with vehicles being allowed through alternately.
⭕ A height restriction will also apply during night-time works: only vehicles with a height of up to 3.00 m will be permitted to enter the tunnel. During the daytime, transit will take place without additional restrictions.
According to the published schedule, night-time works will be carried out during the following periods:
• 11 January – 2 April 2026
• 13 April – 8 May 2026
• 19 May – 26 June 2026
During the summer and autumn months, traffic in the tunnel is expected to operate without disruptions. An exception will be 15 September 2026, when the tunnel will be completely closed in both directions from 19:30 to 01:00 due to Italian–Swiss safety exercises.
