One sector that is undergoing a transformation process, particularly in light of climate change and the climate crisis, is the mobility sector. The mobility transition requires a comprehensive set of different measures. Technological innovation and digital change alone will not be enough to achieve the climate targets and reduce land use. In addition to promoting the development and implementation of new technologies the state therefore must restrict traffic that is harmful to the climate and promote a shift to more sustainable forms of mobility. From a legal perspective, the question arises of what role public law has in the mobility transition. It is necessary to examine whether on the basis of the existing legal framework, the administration has the necessary instruments to drive forward the necessary changes. An analysis of the exiting legal framework for the mobility sector shows, that a successful mobility transformation requires also a transformation of the law. Firstly, this concerns the legal possibilities for the administration to restrict road traffic for climate protection reasons, which have been very limited in Austrian administrative law so far. Further questions arise in relation to the integration of alternative mobility services such as car sharing or on-demand transport into the public transport system. This is because the current system for planning, organization and financing of public transport in Austria only applies to the conventional public mass transport services. Furthermore, the legal framework for sectors that are important for mobility behaviour, such as housing, needs new instruments to implement sustainable mobility concepts, including alternative mobility services like car- or bike-sharing in the residential environment during the planning of new urban development areas and the transformation of the existing building stock. Based on these and other selected examples, this contribution aims to show the extent to which the legal foundations and instruments in the mobility sector are subject to a transformation in the context of tension between new technologies, restrictions and guaranteeing services of general interest.