II- Can urban planning lead to sustainable mobility?The separation of functions in the urban fabric, a corollary of low density extensions, is also responsible for the increased role of the automobile in travel.As such, Asian cities, such as Tokyo or Hong Kong, but also European cities, including Paris and Berlin, would be less expensive in energy than their American counterparts.However, a large part of recent urbanization consists of the relocation of equipment or places of activity formerly located in denser sectors and better served by public transport.