The SMART CITY is an important field for ubiquitous computing (UC), ambient intelligence (AmI), connected vehicles (CV), and new styles of User Interfaces, mainly mobile. Data vitalization related to in-city data collection and their appropriate diffusion to city actors (private and professional) and their services (applications) is one issue. In a more precise and specific context of dynamic lane allocation system, which is presented in this paper, we describe the use of Location-Based services and Internet of Things, as well as the User Interfaces proposed. A simulation environment allows us to conduct a first validation of the system and to study acceptability of User Interfaces before in-the-field deployment.