Study On The Expressway Scale And Layout Of Big City In Our Country

As the expand of the urban terra in the large cities, the economical activities become more and more flourishing and the demand of traffic develops greatly, the stress of the urban transport network becomes more and more big. Especially the unintegrality of the urban transport network makes the traffic confusing, the comparative lag of the planning and construction of urban high grade road is the common question in our many large cities. with the expansion of a new round of master plan of city of our country, the planning and construction of expressway are regarded in every large city. So how to ascertain the scale and layout of the expressway becomes the key of the traffic planning.Firstly this paper expatiates the origin and the cause of formation of the urban expressway and discusses the conclusion that the development of the expressway due to the expand of urban terra and the evolvement of the transport mode. On the basis of enumerating the characteristic of the domestic and international expressway planning and construction, this text analyses the peculiar nature that expressway is in the network system of the city traffic and the position and function that expressway is in social development and social activities.While the study of the scale of expressway in the city , this text confirms the principle that expressway scale should match with city traffic demand development at first, then using the space-time consumption law to carry on the discussion to the traffic capacity of expressway and using regressing analysis to analyzes the expressway transportation demand, on the basis of principle of equilibrium of supply and demand this text gained the corresponding expressway scale calculate model and using scale calculate to prove to calculate the expressway scale of Hefei finally.In the course of study on the layout of expressway in the city, putting forward the view that the layout of expressway must be combined with urban shape on the basis of explaining the layout planning principle of expressway and analyzing layout influence factor of expressway at first; then it divide urban shape into concentrate type and groups of group two big class, and to make analysis with the expressway of adaptation it; Using traffic unit divide method and his speed divided principle to carry on the research the expressway layout method and combining the expressway layout planning of Yantai to make Example analysis finally.Urban expressway planning projects should be appraised after drawing. This text combines the characteristic of the system of expressway and proposes a whole set of evaluation index systems, have analyzed and provided the computing technology in detail to these indexes , this text chooses simple matrix law to appraise expressway planning projects after analyzing many kinds of synthesis appraisement finally.