The issue of the presented work is to publish on line a dynamic cartography system of the transport traffic evaluation, based upon the Alsace (France) regional level experiment. After a large design work of a transport database, arose questions about accessibility, data updating, choice of information processing systems, and development of Internet tools. Three points of view will be approached: the system design from the user point of view, the raised questions of communication and the data-processing. The synthesis allows analyzing the experiment of the installation of a Catalyse tool at a public State level service, at a French "région" level.