关于双环控制模式的环形交叉口信号配时优化模型.pdf

Study on Optimal Timing Model for Signalized Roundabout Intersections 1 1 1 Yuntao CHANG , Yu BAI , Daniel(Jian) SUN 1 School of Transportation Engineering, Tongji University, 4800 Cao’an Road, Shanghai 201804, China, PH (86-21) FAX (86-21) email: crchanghp@163.com ABSTRACT This paper presents a general signal control model for roundabout intersections. By studying the characteristics of signal control and vehicle movements occurred at roundabout intersections, the wave theory, along with the HCM2000 delay function is employed to analyze the features of each part of the vehicle delay, respectively. Then by setting the objective function and constraints on timing split, phase sequence, the paper proposed a theoretical optimal timing model for roundabout intersections based on the traditional dual ring control pattern. Finally, a case study was provided to illustrate the effect of the model, with numerical results indicating that the proposed optimal timing model is capable to produce satisfying timing splits. KEYWORD: Signalized Roundabout Intersection, Optimal Timing, Dual Ring Pattern 1 INTRODUCTION Practically, roundabouts have been widely used in many cities in China because of it many advantages, such as few conflicting points, continuous traffic flow, driving safety, easy to manage, etc. However, with the growth of urban traffic volume, roundabouts are becoming the “bottleneck” of urban traffic because its comparable low capacity due to the unique design mechanism. During the last decade, some researchers have focused on the signal control for rou