1.225J 2002秋季课程：交通流量系统(Transportation Flow Systems) 1.252J 2002秋季课程：都市运输规划(Urban Transportation Planning)
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几个城市安装了动态收费系统，按交通流量收费不同。
Several cities have installed dynamic toll systems whose charges vary according to traffic flow.
该系统不是受制于自然交通波动的影响，恰恰相反，而是利用那些优势即随机的交通流量间隙帮助改善交通流量。
Instead of being stymied by natural fluctuations in traffic, the system takes advantage of them, using random gaps to help improve traffic flow.
简单介绍了空中交通流量管理和决策支持系统的特点，对一种四阶段规范化数据建模方法加以改进。
Features of air traffic management and decision support system are introduced. Then, an improved four-stage standardized modeling method is proposed.
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