ABSTRACT
The equipment and systems of a tunnel are essential for the safe use of this particular transport route. These systems are often all but invisible for the user and only play a role in certain specific circumstances (in the event of unexpected incidents inside the tunnel). The equipment and systems in question have evolved enormously over the years and made a significant contribution to ongoing safety improvements (PDCA) and the avoidance of potential tragedies. The tunnel is a special environment where an incident such as a fire can suddenly endanger the lives of users and the integrity of the structure. The human factor remains the element that is the most difficult to control, while electromechanical devices have benefited from ongoing and favorable technological development. Today’s devices and systems offer increased availability thanks to the introduction of redundancy concepts and deteriorated functionality, and contribute to a safer, less-interrupted management of tunnels.
