从城市路网的优化改造、城市道路的合理定向和城市交通信号灯智能控制三个层面，系统的分析和讨论城市交通的优化改造与智能管理；
By three levels of the optimal modification in the traffic network, reasonable orientation of the roads and the intelligent management, we discuss and analyze the traffic problem in a system view.
交通数据是交通规划、管理与控制的基础，尤其对智能交通系统的建设和运营具有决定性作用。
Traffic data is the basis of transportation planning, traffic management and control, and it plays a decisive part in the construction and operation of the intelligent transportation system.
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