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People flow
People flow as refers to numerous people moving, around buildings, around cities or across borders.
==Towns and cities==
Urbanization creates a need for managing traffic flow in cities. As of 2005 more than 50% of the world population lived in cities and the process of urbanization is expected to continue.〔(Federal Agency for Political Education Germany on UN World Population Prospects )〕
As the population in cities increases, and the subsequent environmental challenges need to be taken care of, cities are forced to grow tighter and upwards. Challenges arising from this trend are the congestion and crowding of cities. However, as history records show, successful urbanization is a prerequisite for economic growth.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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