The goal of the STREETLIFE project is the reduction of carbon emissions through a sustainable mobility concept in cities based on ICT. In particular, the aim of the project is to reduce the number of car trips by i) informing commuters about the existing transport alternatives and their real value (in terms of time, cost, carbon footprint), ii) enhancing public transport to meet the needs of the citizens and of the city, iii) promoting the usage of sustainable transports through (virtual or real) incentives.STREETLIFE will deliver a prototype urban mobility system that• Integrates heterogeneous information sources both directly and indirectly related to traffic. The data sources are traffic information provided by the municipalities, data collected from vehicles and mobile devices, and data from sensors. All data is stored in one Open Data Platform that employs new approaches for capturing, storing and processing this data.• Offers to the citizen safe, personalized, and real-time routing solutions covering all modes of transport to achieve the best experience during the entire travel, thanks also to advanced user interfaces• Offers to the traffic management centres and city administration sophisticated ICT solutions to control the mobility resources and policies and to proactively enhance them.• Establishes a new value-added chain offering an interface to mobility service providers and commercial enterprises to actively contribute to carbon reduction by proposing incentives rewarding environment friendly behaviour.The effectiveness of the solution will be proved through an in depth evaluation on three city pilots (Berlin, Tampere, and Rovereto) involving end-users. Moreover, STREETLIFE will perform an impact assessment of the solution in terms of traffic situation, end-user behaviour, and reduction of carbon emissions.