Abstract:As an intersecting node of Inner Ring Expressway and Yuwu Expressway, North Ring Interchange is a standard full clover-leaf interchange of expressway. It has been in operation for many years, and its traffic capacity has hardly met the demand for current traffic volume, which causes severe congestion. The overall idea of its reconstruction is to improve the traffic capacity of the main line in accordance with the urban road standards in order to eliminate the weaving problems of the full clover-leaf interchange. By building the new directional ramps in accordance with the main traffic flow, the overall traffic capacity and operation efficiency of the interchange are improved, and the traffic congestion is relieved.