In 2008-9 the first idea of mapping the situation in Petržalka - Bratislava from traffic planning point of view defined the possibility to create a new situation for development of tramway infrastructure across the river Danube. The paper is dealing with the tools of traffic engineering surveys observing the situation in modal split and capacity of bridges in Bratislava from which was created a complex transport model. The results from the transport model showed the future collapse by overflowed situation on the street network and found the way to start with preparing the new Carrying System of Integrated Public Transport using the multi-modality of rail tracks in the agglomeration of Bratislava. Nowadays Bratislava has its first section of new tramway infrastructure from the downtown of the city connecting the all radials of the city toward the southern largest housing estate Petržalka. This section is prepared for operation.