The Research Of Distribution Planning Of Interchange In Highway Network

The interchange is an important part of the highway, it has spatial many layers which can change direction. As a vital point of highway, the interchange has these functions such as converting and controlling the traffic flow. The interchange is also an important content in the highway network planning, the reasonable layout of the interchange benefit a lot. It can develop the network function, as well as guarantee traffic flow continuously and reduce delay with avoiding traffic jams and increase network performance. It also benefited to increase network reliability, balancing the flow, and promoting the development etc.Firstly from the aspects of society and economy and technology and the circumstance, necessity of the interchange layout was analyzed, then the situation of the interchange was introduced, so the meaning of this research was illustrated.Secondly, from both tiny and macro view, the influent factors of the interchange layout were analyzed, the planning principle was also put forward. By analyzing the conjunction form and quantities, the relationship between highway with urban was studied, their formation mechanism was also revealed ,so the planning steps were put forward.Then the author analyzed the planning contents and put forward the layout method. By analyzing relation between interchange with urban scale, analyzing the characteristic of population economy and traffic demand etc, the analytic quantitative analysis in principal component analysis was put forward, the need that city to the interchange was predict, and by analyzing supply ability to exit and entrance of city road system judge the possible position of the interchange.Next the method how to choose the type was given in the highway planning proceed, by analyzing the interchange form, the interchange was divided into the different scale grade, the suitable scope of the different scale grade was concluded.By adopting the expenses performance method, the interchange quantities was evaluated, the interchange layout was overall merited by the analytic hierarchy process.In the end, an example that interchange layout was analyzed in the proceeding of highway planning.