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There are several ways to optimize life cycle performance whilst maintaining the required level of road tunnel safety. One possible approach is based on monitoring the Reliability, Availability, Maintainability and Safety (RAMS) of systems, based on pre-defined requirements. This methodology has been extensively used in many industries (Military, Aerospace, Chemical, etc,). In the transport sector, it was first used in the railway industry, but can easily be adapted to road transport, including road tunnels, and is thus gaining increasing interest from both private and public operators. A new technical report on this specific subject was produced late 2018 by the Road Tunnel Operations Committee.