The Mont Blanc tunnel is open 24 hours a day all year long.

To allow maintenance work, there will be a contraflow from 10:30pm to 6:00am the following nights : July 20 to 23.

The contraflow will be set as follows :

Possible inconvenience from 9 pm to 10 pm and from 6 am to 7 am due to the transit of any vehicles under escort.