“9·11”事件的发生,以及事后采取的交通管制,使美国的商业供应链几乎全面瘫痪。美国连接世界各地的航空运输延迟,东西海岸之间的陆上往来也受到层层安全检查的阻隔。因为海外供货的中断,福特汽车公司只好宣布几处工厂停产。乔治亚理工学院的一项研究表明, The occurrence of the September 11 incident and the traffic control taken afterwards have almost completely paralyzed the commercial supply chain in the United States. The delays in air transport linking the United States to the rest of the world and the land exchanges between the east and west coasts are also obstructed by layers of security checks. Ford Motor Company had to announce closure of several factories because of disruptions in overseas supplies. A Georgia Institute of Technology study shows that,