Mont Blanc Tunnel closed due to renovation work from 16/10/2023 to 18/12/2023

After consultations at government and regional level, the technical maintenance work “requires the total closure of the structure for nine weeks”, indicates the GEIE-TMB in a press release.
This work of “replacing slab elements in the central portion of the tunnel” and “changing accelerators (fans) on the vault” will precede a “test site to renovate the vault (...) postponed to 2024.

Maintenance work on the Mont Blanc tunnel was initially scheduled for September 4, but a spectacular landslide on August 27 in the Maurienne valley led to the closure of the Fréjus tunnel, another important route between the two countries.
To avoid congestion, the renovation work of the Mont Blanc tunnel was then postponed, and the work split into two sections.
In its press release, the GEIE-TMB, which “estimates that around 90% of heavy goods vehicles will head” towards Fréjus, also ensures “that it will do everything possible to ensure that traffic can be restored before December 18”.

Find the dates and times for traffic interruptions here.