Today’s distribution of residences and workplaces is a result of availability of cheap oil combined with human preferences for residence in low-density areas. Having reached Peak-Oil nowadays, common motorised mobility is under scrutiny: Not only its massive CO2 output but, most of all, its future scarcity demands urban and regional planning to anticipate the sustainable city of the future. In our work, we have looked at the city of Vienna, in which we have researched patterns of mobility regarding commuters. Our final goal is redensification as a means for transformation of the present state into a walkable city. To make that possible, our analysis provides insights into necessities of mode switching, according to the distances from workplaces. The model which we present is applicable not only to our research area, but to a variety of cities that want to achieve a sustainable settlement structure.