基于“位移进出口”的畸形交叉口渠化改善研究

Study on channelization improving of deformity intersection based on “entrance and exit shifting”

以福安市G104-世纪大道畸形交叉口为研究对象,在考虑了城市地标保护的前提下,分析该畸形交叉口早/晚交通流量流向、道路几何条件及存在问题的基础上,充分利用原有道路交通系统,旨在解决该畸形交叉口特殊几何线形与主要交通流冲突点之间的矛盾,提高交叉口通行效率,减少交通冲突,降低交通事故,保证交通流高效安全地通过交叉口,提出"前移停止线"和"位移进出口"两种交叉口改善方法,利用VISSIM仿真软件评价渠化方案.结果表明:两种渠化方案均对交叉口交通运行有所改善,但"位移进出口"改善方法效果更为显著.其中,方案1交叉口延误降低26.8%,饱和度降低16.3%,平均停车次数降低20.5%;方案2交叉口延误降低46.5%,饱和度降低27.9%,平均停车次数降低38.5%.

Taking the malformed intersection of G104-Century Avenue in Fu’an as the research object,on the premise of considering the protection of urban landmarks,based on the analysis of the traffic flow direction,road geometry and existing problems of the malformed intersection,make full use of the original. The road traffic system aims to resolve the contradiction between the special geometric line shape of the deformed intersection and the main traffic flow conflict point,improve the traffic efficiency of the intersection,reduce traffic conflicts,reduce traffic accidents,and ensure that the traffic flow passes through the intersection efficiently and safely. The intersection method of"forward stop line"and"entrance and exit shifting"were used to evaluate the channelization scheme by using VISSIM simulation software.The results showed that both channelization schemes had improved the traffic operation at the intersection,but the effect of the"entrance and exit shifting"improvement method was more significant. Among them,the delay of the first intersection decreased by 26. 8%,the saturation decreased by 16. 3%,the average number of stops decreased by 20. 5%;the delay of the second intersection decreased by 46. 5%,the saturation decreased by 27. 9%,and the average number of stops decreased by 38. 5%.