ABSTRACT
Following the elaboration of a Tunnel Safety Documentation for the T4 tunnel, several deviations from the European and national Standards were identified. Moreover, due the tunnels’ special characteristics and its ageing equipment, the rehabilitation plan had not only to upgrade the level of safety to “Category A” as per the ADR agreement, but also to perform heavy maintenance works and provide sustainable solutions for the tunnel operations and the local community. The construction methodology poses significant challenges in the operation and the construction. Therefore, special provisions, technical and operational, were required in order for the transport of heavy and dangerous goods vehicles to be allowed in the tunnel during construction. The Covid pandemic and the geopolitical conditions (Ukraine war), seem to negatively affect the projects’ duration and financing. With a budget of more than €20M, it is the first tunnel upgrade project of this magnitude and complexity in Greece, that sets the basis as refence for future tunnel upgrades.
