The Evaluation On Urban Traffic Index Based On Integrated Methods

During modern industrial society, resources have been concentrated to a small number of large cities, in order to get "economy of scale". Because of this, "big city malaise" will be unavoidable. In recent years, the rapid growth of the total number of cars make transport resources develop slowly, and form a traffic bottle-neck, urban traffic problems have become the most concentrated expression of "big city malaise". This paper originates form 973 project of country "system identification theory and ecological control mechanism of modern city 'malaise' " , the paper uses the existing traffic information fully, quantizes the indicators of city transportation system's integrative state and makes a relative number- traffic index. It not only makes the government departments, traffic management person, divers understand the overall state , but also useful for the public getting hold of information on traffic conditions. At present, the research about the comprehensive evaluation of domestic urban transport system is still in its initial stage, the research about traffic index is less. Therefore, this paper puts emphasis on the research about the theory and compute methods of traffic index. We try to use transport index to evaluate the development of the urban transport system.Firstly, This paper analyses and summarizes the exisiting study results of traffic index, we extracted some ideas and methods from those study results that can be used in this paper. Then we studied the comprehensive evaluation of the system and the different methods of calculation model, we choose comprehensive evaluation method - AHP and the exponential model - linear weighted method applicable to the evaluation of city transportation.In the process of compiling the traffic index, we selected indicators based on "unimpeded projects" and principles of choosing indicators. The urban transportation system will be divided into target tier, criterion tier and index tier, and the target tier is evaluation of integrated urban transport, the criterion tier is divided into ten subsystems, these are traffic management facilities, road infrastructure, traffic safety, traffic order and so on. The index tier has 52 indicators, these indicators are made of 43 quantitative indicators and 9 qualitative indicators. We carried out a detailed analysis for each indicator.We used AHP in determining the weights of index tier to criterion tier , judgment matrix forms will be filled out by experts, then use sum-multiply method to calculate relative weight, Finally using the matrix multiplication to obtain the absolute weight. At the same time, we use coefficient of differentiation method in determining the weights of criterion tier to target tier. The combination of objective and subjective methods can make the weights more precise.Take Wuhan City for example, we collect the data of indicators from "2006 Annual Development Report of Wuhan Traffic" and "2006 Wuhan Statistics Yearbook" , we make indicators non-dimensional referencing to generalized function and classification table. We use linear weighted method to calculate urban transport index. Finally, we assess the applicability of urban transport index.