Whether by road or rail, today's passenger transport system has evolved from a mere means of communication to a true "travel experience" that begins at the station. Operators are keen to ensure that users feel comfortable on board their fleet of vehicles, surrounding them with comfort and high-level technology. Transport is a complex system that needs to raise security standards as it is characterized by a high number of people served and sites to be protected, a network widely spread over the territory, a service that cannot be interrupted as it is essential for the Nation and subject to a strong media exposure that makes it vulnerable/exposed to acts of aggression. Moreover, there is the necessity to increase the performance, through an in-depth knowledge of the behaviour of the clientele, which can also be used for marketing initiatives.