The different models of Gates contribute to the reduction of fraud by ensuring better control of passenger traffic and By making it possible to meet this reduction, while improving the ease of access to rail and urban transport networks. The Compagnie des Signaux gates are based on a performing access control by optical detection in addition magnetic or contactless reading systems. The principle of the detection allows to achieve a filtering with a level control by reducing the possibilities of circumvention to fraudulently access public transportation or hospitality sites.