| Along with our country economy development, the automobile inventory is increasing rapidly, the municipal transportation supports stops up the question to become day by day serious, the road traffic jamming already became in the modernization urban development a big difficult problem.In Chinese many big cities, the main main route peak time interval vehicle speed has fallen to 12km/h about, even some paths are smaller than 7km/h, the loss which the urban road traffic jam creates are various, accurately estimates with difficulty.Alleviated the urban road transportation to support stopped up already becomes the city an important task. Along with the urban construction scale daily expansion, the vehicle capacity sharp growth, the road traffic supports stops up has become one of city questions which our country big or media.sized cities face generally, the long.enduring transportation supports stops up and brings the environmental pollution and so on a series of social question, hindered the urban economy to continue the healthy development seriously.How aims at the city the transportation present situation to adopt the effective action government transportation to support stops up, has become our country municipal transportation construction and the social economy development urgent matter.The 90's mid and late parts, Shanghai and so in the city central area 50% traffic lanes the rush hour degree of saturation achieves 95%, entire day the degree of saturation surpasses 70%, the average vehicle speed drops lOkm/h.Between the municipal transportation demand and the transportation supplies contradiction is day by day incisive, the road traffic supports stops up the phenomenon to be more and more serious.The establishment science reasonable comprehensive traffic control system has the vital significance to the municipal transportation development.Changchun, as the capital of JiLin provience, is in a period of high economic growth,, the pace of urban development is going faster and faster, and the number of motor vehicles grows so rapid that urban road traffic increases, but the construction of road transport infrastructure is relatively slow, and traffic management level is relatively backward. Faced with this unavoidable traffic jam, traffic management departments shall, in accordance with their own specific situations and learn from the advanced experience of the developed countries, to take positive measures to solve practical problems.This paper combines the existing traffic conditions in Changchun City and the situation of our country, researching the integrative appraise method and consider of city traffic jams, and used in the existing traffic manage in Changchun City. Based on the WebGIS, set up the traffic manage geography information system, achieve a lot of functions, such as traffic data storage, enter, editor, modification, copy, inquire, search, ration account, stat analysis, and so on. Accomplished the service function of this system, include using the secondary development tools Arclnfo to compile service system, achieving the dynamic traffic information manage, as net analysis, accident analysis, duty manage, etc. Implementing dynamic control and real time display for excessive object, data collect of GPS receiver and communicate among computers.Quoting the Dijkstra shortest path algorithm one of the classic graph theory to optimize the search path, thus reducing the scope of the search nodes and the number of permanent marker, got the shortest distance choice. Making the Changchun City Square Ring (such as People's Square) as a research object, establishing a mathematical model to analyze the specific data, a better solution of Ring Square traffic congestion problems is made.In this paper, through the establishment of traffic management GIS(geographic information systems), forecast changes in city ring road traffic and mastered the traffic jams and road section development trends, finally elicit the countermeasures of the traffic congestion. |
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