As a guide element of urban expansion and the urban structure framework, road traffic has a complicated relation with spatial form evolution of old cities.
作为城市拓展导向要素以及城市结构骨架的道路交通，与旧城空间形态演变之间存在复杂的关系。
And there is different urban spatial structure form because of different form of urban road network.
不同的城市路网形式下有不同的城市空间结构形态。
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