With the progressive increase of traffic flow year by year, traffic safety of expressways has been an in-creasingly important concern in the society. The expressway interchange is the frequent spot for traffic accidents, especially the ring ramp. Therefore, reforming the interchange ramp has become an urgent problem. By investi-gating Changzhou West Beltway Minghuang hub interchange project, this paper established the simulation model of Minghuang ring hub interchange ramp through the microscopic traffic simulation software VISSIM. It conduct-ed comparative analysis of various controlling indexes under different schemes and obtained the best widening 0.50 m.%随着交通流量逐年递增,社会对高速公路的行车安全性要求也在不断提升,而高速公路互通立交又是交通事故的高发地,尤其环形匝道处更表现为事故多发段.因此,对互通立交环形匝道进行改造已经成为亟需解决的问题.结合常州西绕城高速鸣凰枢纽互通立交工程实例,采用交通微观仿真软件VISSIM建立鸣凰枢纽互通立交环形匝道的仿真模型,对比各种改造方案下的各项控制指标,从而确定最佳的行车道加宽值为0.50 m.
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