The City of Paris Administration manages the road traffic in the French capital, using several specialized information systems: (1) the SURF 2000 system collects traffic data, and manages traffic control and supervision on the urban network; (2) the CORRIDOR system collects traffic data on the Paris ringway; (3) the IPER system produces multi-strategy messages to be displayed over the 400 variable message signs scattered along the Paris ringway and main avenues; and (4) the SGI information server which, in a short time, will centralize all traffic information intended to the public. The need to integrate in real time all these different systems and to allow them to exchange information with other systems managing the related roadway networks (for example, motorways managed by the S.I.E.R. [Service Interdepartemental de l'Exploitation Routiere]) has needed the design of a specialized and flexible traffic data exchange system, transparent to the users, the S.E.D.T. [Systeme d'Echange de Donnees de Trafic], which is described in this paper.
Abstract