Weather
Temperature
30.1°
French tunnel entrance apron
26.6°
Italian tunnel entrance apron
Mont Blanc Tunnel traffic
Weather
Temperature
30.1°
French tunnel entrance apron
26.6°
Italian tunnel entrance apron
Mont Blanc Tunnel traffic
Important projects and works
Renewing of road deck, a civil engineering challenge ifor safety
In the spring of 2024, the last stage of the overhaul of the road deck in the central section of the Mont Blanc tunnel, amounting to 240 metres, was completed.
The overhaul consisted of replacing the elements that support the roadway, underneath which there are ventilation channels.
By means of very complex organization, the technical solution adopted made it possible to work mainly during the night and to open the tunnel for vehicle traffic every morning, ensuring the safety of construction site staff and tunnel users. This procedure had been tested in 2018. The feedback from the experience enabled us to define the most appropriate method for subsequent works between 2021 and 2024.
With this project, the road deck of the Mont Blanc tunnel has been completely renovated over a total length of approximately 1,700 metres in the central area of the infrastructure.
If we take into account the entire road deck overhaul project, implemented between 2018 and 2024 on approximately 1,700 linear metres of tunnel, the investment amounted to €60 million, funded 50% each by the two concessionary companies, SITMB and its French counterpart ATMB.
The images below refer to the work carried out in 2018.
The overhaul consisted of replacing the elements that support the roadway, underneath which there are ventilation channels.
By means of very complex organization, the technical solution adopted made it possible to work mainly during the night and to open the tunnel for vehicle traffic every morning, ensuring the safety of construction site staff and tunnel users. This procedure had been tested in 2018. The feedback from the experience enabled us to define the most appropriate method for subsequent works between 2021 and 2024.
With this project, the road deck of the Mont Blanc tunnel has been completely renovated over a total length of approximately 1,700 metres in the central area of the infrastructure.
If we take into account the entire road deck overhaul project, implemented between 2018 and 2024 on approximately 1,700 linear metres of tunnel, the investment amounted to €60 million, funded 50% each by the two concessionary companies, SITMB and its French counterpart ATMB.
The images below refer to the work carried out in 2018.
Vault restoration works: the first pilot construction site came to an end on 16 December 2024
At the end of fifteen weeks of intense activity by the staff of TMB-GEIE and the contracting firms, the Mont Blanc tunnel reopened to traffic on Friday 12 December 2025 at 10pm.
Owing to the type of works, the geometrical features of the tunnel, the need to dismantle all the technological systems in the areas concerned and to ensure workers’ safety, no vehicle traffic could be allowed under any circumstance, even temporarily, during the entire duration of the works.
The Mont Blanc tunnel, which is more than 60 years old, is the first of the large European tunnels to undertake a major overhaul of its structure. In addition to the routine maintenance carried out during night-time works, this major project is entering a phase in which more extensive civil engineering works are required. These major works on the infrastructure are needed to ensure its long-term sustainability.
The tunnel sections identified for these pilot projects are characterized by various configurations that may be encountered along the tunnel.
A “project within the project” was carried out to address the historical water inflow at G26 (approximately 300 liters per second), about 3.6 km from the Italian portal: this project made it possible to permanently secure the area and ensure effective drainage in order to prevent any water pressure buildup; The operation was completed with the installation of a manhole that will allow for future inspections.
This year’s experience is key to the continuation of the restoration. It will allow for the analysis of all parameters, and only upon completion of these phases will it be possible to determine more precisely how to proceed with the restoration of the vault.
The goal will be to identify the best operational methodology, specifically regarding duration, the technology employed, the long-term impact of the closure, and alternative routes, etc.
For the future restoring of the vault, a second pilot stage of experimental works will be carried out in 2025 in the tunnel, which will enable, together with the experience acquired in 2024, the study of all the parameters; only at the end of these stages will it be possible to more accurately determine the way forward for the restoring of the vault .
The work carried out in 2025 required an overall investment of €21 million from the two concessionary companies (SITMB for the Italian side and ATMB for the French side).
Owing to the type of works, the geometrical features of the tunnel, the need to dismantle all the technological systems in the areas concerned and to ensure workers’ safety, no vehicle traffic could be allowed under any circumstance, even temporarily, during the entire duration of the works.
The Mont Blanc tunnel, which is more than 60 years old, is the first of the large European tunnels to undertake a major overhaul of its structure. In addition to the routine maintenance carried out during night-time works, this major project is entering a phase in which more extensive civil engineering works are required. These major works on the infrastructure are needed to ensure its long-term sustainability.
The tunnel sections identified for these pilot projects are characterized by various configurations that may be encountered along the tunnel.
A “project within the project” was carried out to address the historical water inflow at G26 (approximately 300 liters per second), about 3.6 km from the Italian portal: this project made it possible to permanently secure the area and ensure effective drainage in order to prevent any water pressure buildup; The operation was completed with the installation of a manhole that will allow for future inspections.
This year’s experience is key to the continuation of the restoration. It will allow for the analysis of all parameters, and only upon completion of these phases will it be possible to determine more precisely how to proceed with the restoration of the vault.
The goal will be to identify the best operational methodology, specifically regarding duration, the technology employed, the long-term impact of the closure, and alternative routes, etc.
For the future restoring of the vault, a second pilot stage of experimental works will be carried out in 2025 in the tunnel, which will enable, together with the experience acquired in 2024, the study of all the parameters; only at the end of these stages will it be possible to more accurately determine the way forward for the restoring of the vault .
The work carried out in 2025 required an overall investment of €21 million from the two concessionary companies (SITMB for the Italian side and ATMB for the French side).
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