Tomorrow‘s cities : environmentally friendly mobility, low noise, green spaces, compact housing and mixed-use districts / published by: Umweltbundesamt (German Environment Agency), Department I 3 „Verkehr, Lärm und räumliche Entwicklung“ ; authors employees of Department I 3 Transport, Noise and Spatial Development at the German Environment Agency ; editor: Dipl.-Ing. Christa Friedl