Abstract:In order to solve the traffic dilemma of "fast ring but not fast" in Nanning, it is necessary to improve the traffic nodes along the route. Taking the reconstruction and extension project of Yongwu interchange in Nanning City Ring Expressway as an example, a research is made on the design of the reconstruction and extension of urban interchange. Based on the analysis of the current situation, existing problems, functions and traffic characteristics of Yongwu Interchange, the idea of interchange transformation is combed and the key points of the interchange scheme selection are summarized. Micro-simulation models were established based on the respective current situation and the improved interchange type for the analysis of the effect of the improved interchange reconstruction. It is concluded that the traffic is smooth and continuous, the service level is upgraded from F to C, and the improvement effect is significant after the interchange transformation. It is finally concluded that the function orientation of urban interchange reconstruction and expansion should be adapted to the overall urban traffic planning and the existing interchange, and the existing interchange should be comprehensively investigated and analyzed. On the premise of meeting the traffic demand, the scheme comparison should be carried out from the aspects of land acquisition, demolition and removal, project investment, and etc. The design scheme should be convenient for construction and organization so as to reduce the negative impact of reconstruction and extension of the project on the existing road traffic and the production and life of residents along the route.
