This article is based on an ongoing multidisciplinary research program that includes several French smart cities (Rennes, Dijon and Lyon). Named TOSC (Organizational Transformation of the Smart City) and funded by the scientific interest group Marsouin (2020-2022), it seeks to capture transformations of metropolises based on their smart city objectives by taking into account three elements. On the one hand, communication strategies and some different discourses they generate, which will not really be discussed here; on the other hand, the role of governance induced by projects carried by Lyon city that will be at the center of this paper. At the same time, the third element is that of mobility issues, especially present in smart city projects based on large-scale experiments. Indeed, in this case, Métropole de Lyon, 28 projects linking mobility and data-services were developed between 2010 and 2020 to make the metropolis a smart city (Angelidou, 2017 – Arsène and Mabi, 2021) and co-build it with its inhabitants; data and urban mobility services are the structuring paradigm of this transformation strategy (Ascher 2001 - World Bank, 2009).This positioning of metropolitan public action materializes its transition to smart city from mobility and its data-services supposed to provide various solutions to urban congestion and climate challenge (Le Corf, Paquienséguy, 2022). This series is also part of territorial reform that obliges metropolises to confront data management (Inspire Directive, 2004) and to comply with constraints stemming from MAPTAM Law in 2014, NOTRe Law in 2015 and the Mobility Guidance Act in 2019 (Paquienséguy, 2020). Thus, this mobility paradigm structures at the same time this strong and evolving metropolitan context (Ascher, 1995; Kaufmann, 2014), the place of action and experimentation, and the power that carries it “to participate in a new political design supported by metropolises in terms of services to public, with a view to dynamism of businesses and quality of life of users in their urban journeys” (Lecorf, Paquienséguy, 2022). Governance, mobility programs and experiments: three keywords that structure this article, metropolitan governance that mobility projects transform, and social experiments that are both the hand equipped and the justification.