Reliability Research On Urban Road Network

City is the political, economic and cultural center of certain territory, concentrating most of the social material wealth and spiritual wealth. Urbanization is the affirmation and pursuing of the people to the urban style of work, life, study and relaxation, and symptoms the level of economic growth. As the "blood" of the city, urban traffic transmits flow of passengers, goods and information continuously between different function districts. Being the material foundation of urban traffic, road network is the lifeline of the city, which supports other life systems. Its core position has decided its key role in city operation.Urban road network reliability is the level at which the various service it offers can satisfy the demand of trip makers. And, it is one of the important indexes to measure the quality of the road network. Modern urban road network becomes more and more huge and complex; the requirement of people for trip quality is more and more high, those all make road network reliability problem more and more important and outstanding. Researches of road network reliability have been push forward all along by domestic and international scholars, along with certain accomplishment. Because of the short studying history, those theories ever established need to be substantiated, perfected and promoted. Based on the summary of forefathers' research accomplishments, combining the reality of the urban road traffic of our country, various road network layout and their function characteristics has been deeply analyzed; after anatomizing the factors influencing road network reliability, the reliability models of intersection and section of road network has been established; and, road network reliability calculation models has been set up using graph theory and system reliability theory; at last, discussion has been carried out on the actual application of road network reliability theories, namely the completely life period reliability management of road network.