REAL-TIME INFORMATION AND GUIDANCE BASED ON ROAD TRAFFIC AND ENVIRONMENTAL CRITERIA Nikolaos Gavanas Anastasios Tsakalidis Eleni Verani Alexandros Sdoukopoulos Magda Pitsiava-Latinopoulou Aristotle University of Thessaloniki, Department of Civil Engineering, Thessaloniki, 54124, Greece Charis Kouridis Thomas Papageorgiou Elias Blatsis Giorgos Melios EMISIA S.A., Thessaloniki, 57001, Greece ABSTRACT The degradation of the environment and the intensity of energy consumption are highlighted as main issues in the European Union’s agenda for sustainable transport development. Road transport corresponds to 20% of Europe's total CO 2 emissions, while divergence is observed in the Commission’s target values for exposure to particulate matter with the publi c health of urban areas compromised by air quality problems, despite the decrease in NO x emissions. In addition, Europe’s energy dependence is significantly affected by the extensive use of conventionally fueled road vehicles. In many cities, the lack of sufficient and updated information on traffic and its impact on the environment and the energy resources is considered a major deficiency in the effort of developing and implementing the appropriate measures towards sustainable mobility. In this framework, the proposed paper aims at the presentation of the methodology and structure of an ICT platform developed for the collection and distribution of real-time road traffic, environmental and energy consumption data and the provision of dynamic guidance along Thessaloniki’s wider urban road network. According to the platform’s architecture, Floating Car Data is collected through a Global System for Mobile communications network in order to estimate traffic flow using a set of Speed-Flow functions for the classified roadway network. The so-produced traffic database provides input for the real-time estimation of the emission and fuel consumption data by implementing the COPERT 4 model. The platform is supported by dynamic mapping in a Geographic Information System