The document discusses two model districts, Vauban and Rieselfeld, in Freiburg, Germany. It describes how Rieselfeld was developed starting in the 1990s based on principles of short distances between living and working, an orthogonal road network with traffic calming, and a central park. Over 50% of the land is dedicated to living spaces and commerce, while around 13% is public green space. Vauban was developed on a former military site beginning in the 1990s and has high levels of citizen involvement and low car ownership due to its design without parking spaces but with good public transportation and services.