Research On Highway Interchange's Grade And System Of Types In China

At present, interchange's planning and design are always based on the changes of the terrain and objects in order to design interchange's form. The methods are definitely lead to some flaws in the aspects of traffic function for interchange. For example, it can cause traffic jam and blockage, it can also cause idles and waste of the facilities for few traffic flows, etc. Besides, interchange is the comprehensive structure of road and bridge, but the classification of interchange is a technological rank of interchange in application function, and it reflects the technical condition of interchange and the high and low of its indexes. Accordingly, the division of interchange grade is the important contents of planning and design of interchange.From the above mentioned, the paper emphasizes the importance of grade classification of highway interchange through grade situation,grade factors of influence and grade conception for highway interchange in china. The paper also put forward the tentative plan to set up the highway interchanges'grade and system of types, and select the four indexes of alignment quality,capacity,detour ratio of the left-turning ramp and interchange security to analyze the functions of highway interchange and use analytic hierarchy process for dealing with weight distributions of the four indexes in order to determine the functional integrated indexes for highway interchange of all levels , and proposes preliminary basis for setting up the highway interchanges'grade and system of types to make interchange design standardization,rationalization and scientization.