Sustainable road traffic is road traffic that makes optimal use of existing resources. C2X communication technology contributes to this by providing the necessary traffic flow data to distribute road traffic better on the existing road network through intelligent route guidance and traffic management. Improved use of the existing road network is only one aspect of sustainable road traffic. Traffic-related emissions and travel time are others. Also here C2X communication technology can help. Adaptation of the driving speed to traffic light phases is one particular example, where C2X communication helps saving emissions and time because it avoids unnecessary standstill at red lights. But also safety-related applications of C2X communication contribute to sustainable road traffic. If warned early enough about a potential hazard, drivers will approach a dangerous spot slower than without warning. Less accidents are the consequence. Since accidents very often cause a traffic jam or do at least tempt other drivers to slow down in order to satisfy curiosity every accident that does not happen does directly reduce traffic-related emissions.

Sustainability can be quantified in monetary figures very well. Therefore, socio-economic models have been developed in PRE-DRIVE C2X that allow to allocate costs to accidents, traffic jams, emissions and all other relevant traffic-related aspects. Comparing the situation with C2X communication with the without case does directly indicate the impact that vehicular communication has on sustainability. The data gathered in this project provides reliable calculations that sufficiently reflect the situation in the European Union