Congestion brings a lot of negative effects. From economic analysis, we can see that congestion is mainly caused by the gap of private cost and social cost.
城市交通拥挤带来许多负面影响，拥挤产生主要是私人成本与社会成本存在差距。
As the article points out the function's relationship of road's traffic vehicle's velocity-amount, it obtains the calculation formulation of the private cost and social cost of traffic.
利用道路交通的车速-车流量的函数关系，推导出交通个人成本与社会成本的计算公式。
Private cost and benefit deviates from social cost and benefit, this is one of the most common problem for economic society.
私人成本和收益与社会成本和收益相背离是经济社会最普遍的问题之一。
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