With the booming of Chicago Metropolis economy in global trade, the current freightpolicy and facilities fail to meet the increasing freight demands.
随着芝加哥地区在全球化经济中的日趋活跃，现有货运政策和货运设施在应对随之剧增的货运需求时日见乏力。
2
Through simulation, the conclusions that policy makers care about have been drawn and in a certain time period, these conclusions will serve as an important support of the freightpolicy making.