The Mont Blanc tunnel is open 24 hours a day all year long.
To allow maintenance works and safety exercises, a contraflow is set.
The Tunnel will be closed to traffic during the following nights, from 10:00 p.m. to 06:00 a.m.:
- October 24 to 25
- November 7 to 8
- November 17 to 18
- November 21 to 22
Alternating one-way traffic during the following nights, from 10:30 p.m. to 06:00 a.m.:
- November 14 to november 16 inclusive
Possible inconvenience from 9 pm to 10 pm and from 6 am to 7 am due to the transit of any vehicles under escort.