The Gruppo Europeo di Interesse Economico del Traforo del Monte Bianco (GEIE-TMB) is a legal entity under EU law set up on the initiative of the two concessionary companies of the Tunnel, the French ATMB (Autoroutes et Tunnel du Mont Blanc s.a.) and the Italian SITMB (Società Italiana per il Traforo del Monte Bianco S.p.A.), for the purpose of guaranteeing the unitary maintenance and management of the Tunnel. The company has been entered onto the Companies Register of Aosta, has its registered office in Courmayeur, at the Italian tunnel entrance apron, and it has a well established organization on French soil.

After the fire of 24 March 1999, the GEIE-TMB carried out coordination and checking activities during the works on restoration and modernization of the tunnel, in order to ensure that the work was being carried out in totally unified way, particularly with regard to the installation and operation of the safety systems.

In the months leading up to tunnel being reopened to traffic, it had the job of organizing and training its operating staff, including the use of suitable "mock-up" management tests.

Since 9th March 2002 it has been responsible for all the activities connected with the operational management of the Tunnel and of the two areas for the regulation of heavy vehicle traffic situated at Aosta (I) and Passy-Le Fayet (F), it has collected the tolls, has been involved in all the projects relating to safety, and has commissioned all the maintenance works, major repairs and improvements to the infrastructure and the technical equipping of the tunnel.

The “Human Resources” service that is responsible for all matters regarding organisation of the work, employment procedures and internal mobility, trade union relations etc., is directly connected to the Management Committee.

Among the Management Functional Services, besides those of "Secretariat and Assistance to the Management Committee”, a specific role is assigned to the “Communication” service, responsible for public relations, to carry out promotional activities and maintain relations with the information services and with public and private bodies that request to visit the Tunnel and its installations. In fact, the technological innovations introduced to improve safety are of great interest to many observers.

Another important activity to support the Management Committee is carried out by the "Prevention and Quality” service. The main target is to achieve unitary management of the workers’ safety on the work sites, harmonising standards that are different for Italian and French workers. This service is also the centre of the Tunnel area environment condition monitoring activities. The data related to the quality of the air are supplied by Air de l’Ain e des Pays de Savoie (AIR-APS) for the French side, and by the Agenzia Regionale per la Protezione dell’Ambiente (ARPA) ( Regional Agency for Environment Protection) on the Italian side. Noise data is provided by Centre d’Etudes Techniques de l’Equipement (CETE) and by ARPA respectively .

This is responsible for customer relations and organizes the toll collection service at the two entrances to the tunnel. One of the tasks the toll staff is responsible for, in the event of an accident in the tunnel, is to provide support in receiving the public emergency services and evacuating people not directly involved in the incident. It is also the toll staff’s job to give the user the leaflet containing the regulations for traffic inside the Tunnel, paying particular attention to the speed limits and the safety distance between vehicles, and to provide them with all useful information.

This is in charge of all activities concerned with traffic control and the maintenance of safety, both under normal conditions and if there should be an incident.

Through the Safety and Traffic Operators it manages the two Command and Control Posts (CCP), north and south, that operate in tandem, one for control, the other for traffic information; by means of the Safety and Traffic Teams (EST) it controls and guarantees correct application of the traffic regulations 24 hours a day, using special vehicles fitted with first intervention equipment in the event of a vehicle accident or breakdown inside the tunnel. The EST are also responsible for the exceptional transit escort service.

The AST, Safety and Traffic Assistants, out at the heavy vehicle regulation areas of Aosta (I) and Passy-Le Fayet (F), check the pollution class and vehicle dimensions, and give out the Tunnel access passes.

The Binational Police Service, that consists of members of the Polizia di Stato (Italy) and the Gendarmerie Nationale (France), and has operational rooms at the two tunnel entrance aprons, is in charge of checking that the traffic regulations are being observed. To make sure this task is properly carried out there are mixed patrols, each consisting of an Agente di Polizia and a Gendarme, that provide a tunnel patrol service; and this rounds off the safety arrangements.