As the industrial structure changes, factories have been moving from central area of Tokyo region into surrounding area, and the flow of physical goods within the entire urban area tends to increase. In general, as the economy becomes increasingly service-oriented, the physical goods flow tends to decrease. But while Tokyo's share of physical goods flow in the grater Tokyo region has been declining, the share of Tokyo region in the nation has in fact been growing in recent years. This indicates the increased volume of physical distribution and environmental load in the surrounding prefectures, which neccesitates the systematic preparation of physical distribution system taking into account streamlining the collecting & delivery system, but also factory locations and socio-economic system itself.