Abstract : Metropolisation is considered as a set of processes, which revolutionize, since the 1980s, interactions between societies and their territories. In particular, these changes have re-examined the role of transport as a tool for land planning. Thus, transport networks display the ability to structure the metropolitan areas. They permit functionning by interactions between places and also appropriation from individuals and social groups that manage and use networks. The aim of this research is to build a tool for decision support in planning and transport policy that can show the potential of transport networks to provide the structure of the metropolitan area. In the spirit of offering an alternative to “car only” policies, this work focuses on mass transit. Specifically, a modeling approach is conducted and mobilizes the concepts of accessibility and capillary, which are the subject of measurements. These indicators can inform policymakers about the qualities of transport networks studied. The application is conducted on the transportation networks of Nord-Pas-de-Calais and Provence-Alpes-Cote d'Azur regions. The analysis highlights some misses, and to address that development projects in transport were simulated in each region. The results show how mass transit networks can promote metropolitan construction, but also their limits. Indeed, this thesis argues for a coordination of transport policy and land planning.