The way how the traffic - the change of locations of the people, goods, also information - has a decisive influence on the life quality and through the traffic system on the whole community. For relevant modelling of safe and effective transport modes (road, rail, air,..) at this moment in Republic of Slovenia there is no adequate structured data and no developing tools for prevailing type of transport model. ''What happens, if …'' and ''What to do, that …'' are basic questions on which we want to answer with methodological and structurally adequate transport models.