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The study finds that,the traffic congestion will worsen along with the expansion of city size,if the factors of traffic structure,proportion of urban road area,spatial distribution of city traveling,and occurrence intensity of travel are fixed.Therefore,the need for certain public policies and intervention of urban transportation is related with city size.It is an unavoidable and urgent task for the governments of large and supper cities to formulate and implement scientific transportation policies in order to guarantee the operation efficiency of urban transportation system.
The study finds that, the traffic congestion will worsen along with the expansion of city size, if the factors of traffic structure, proportion of urban road area, spatial distribution of city traveling, and occurrence intensity of travel are fixed.Therefore, the need for certain public policies and intervention of urban transportation is related with city size. It is an unavoidable and urgent task for the governments of large and supper cities to formulate and implement scientific transportation policies in order to guarantee the operation efficiency of urban transportation system.