Signal timing optimization model based on dual-ring phase scheme for roundabout  

作　　者：马万经 谢涵洲 白玉 赵靖 杨晓光 

机构地区：[1]Key Laboratory of Road and Traffic Engineering of Ministry of Education (Tongji University)

出　　处：《Journal of Central South University》2013年第2期563-571,共9页中南大学学报（英文版）

基　　金：Project(51178345) supported by the National Natural Science Foundation of China;Project(2011AA110305) supported by the National High Technology Research and Development Program of China;Project supported by the Program for Young Excellent Talents in Tongji University, China

摘　　要：A signal optimization model for roundabout was control concept were used to eliminate the conflict points proposed based on dual-ring scheme and two stop lines for left turns and weaving sections at a roundabout. A cycle length minimization problem was considered to generate optimal signal timings for roundabout, and a set of constraints to ensure feasibility and safety of the resulting optimal signal settings were proposed. Extensive experimental analyses in comparison with signalized intersection reveal that the proposed model is quite promising for application in design of roundabout signals, and the minimum cycle length can decrease from 186 s to 79 s while the capacity increases from 8 682 pcu/h to 9 011 pcu/h under high demand scenario. Sensitivity analysis with respect to the system performance show that the lane assignment plan, number of circulatory lanes and left turn ratio are three critical factors which have dominate impacts on performance of signalized roundaboutA signal optimization model for roundabout was proposed based on dual-ring scheme and two stop lines for left turns control concept were used to eliminate the conflict points and weaving sections at a roundabout. A cycle length minimization problem was considered to generate optimal signal timings for roundabout, and a set of constraints to ensure feasibility and safety of the resulting optimal signal settings were proposed. Extensive experimental analyses in comparison with signalized intersection reveal that the proposed model is quite promising for application in design of roundabout signals, and the minimum cycle length can decrease from 186 s to 79 s while the capacity increases from 8 682 pcu/h to 9 011 pcu/h under high demand scenario. Sensitivity analysis with respect to the system performance show that the lane assignment plan, number of circulatory lanes and left turn ratio are three critical factors which have dominate impacts on performance of signalized

关 键 词：signalized roundabout dual-ring phase single timing optimization left-turn movement 

分 类 号：U491.54[交通运输工程—交通运输规划与管理]