Influence of driver’s yielding behavior on pedestrian-vehicle conflicts at a two-lane roundabout using fuzzy cellular automata  

基于模糊元胞自动机的双车道环岛驾驶员礼让行为对人车冲突的影响

作　　者：LI Chuan-yao LIU Shi-kun XU Guang-ming CEN Xue-kai 李传耀;刘诗昆;徐光明;岑学楷(School of Traffic and Transportation Engineering,Central South University,Changsha 410075,China)

机构地区：[1]School of Traffic and Transportation Engineering,Central South University,Changsha 410075,China

出　　处：《Journal of Central South University》2022年第1期346-358,共13页中南大学学报（英文版）

基　　金：Project(2020YFB1600400)supported by the National Key Research and Development Program of China;Project(2019JJ50837)supported by the Natural Science Foundation of Hunan Province,China;Project(71801227)supported by the National Natural Science Foundation of China。

摘　　要：The roundabouts are widely used in China,some of which have central islands as scenic spots.The crosswalks connecting to the central islands,normally full of pedestrians,have negative impact on roundabout capability and pedestrian safety.Therefore,this study proposes a fuzzy cellular automata(FCA)model to explore the safety and efficiency impacts of pedestrian-vehicle conflicts at a two-lane roundabout.To reason the decision-making process of individual drivers before crosswalks,membership functions in the fuzzy inference system were calibrated with field data conducted in Changsha,China.Using specific indicators of efficiency and safety performance,it was shown that circulating vehicles can move smoothly in low traffic flow,but the roundabout system is prone to the traffic congestion if traffic flow reaches to a certain level.Also,the high yielding rate of drivers has a negative impact on the traffic efficiency but can improve pedestrian safety.Furthermore,a pedestrian restriction measure was deduced for the roundabout crosswalk from the FCA model and national guideline of setting traffic lights.在中国,环岛被广泛使用,一些环岛的中心岛还被打造成城市景观。然而,通往中心岛的人行横道通常占满了行人,对环岛通行能力和行人安全造成严重的负面影响。本研究提出一种模糊元胞自动机(FCA)模型,旨在探讨双车道环岛处人车冲突对行人安全和环岛效率的影响。以中国长沙为例,对模糊推理系统中的隶属度函数进行标定,以推理驾驶员在人行横道前的决策过程。通过使用效率和安全性能指标对仿真结果进行评价,结果表明环内车辆在低流量条件下可以平稳行驶,但当车流量达到一定水平时,环岛系统容易发生交通拥堵。并且,驾驶员较高的礼让率对交通效率有负面影响,但可以提高行人的安全性。基于此,根据FCA模型和中国安装交通信号灯的规范推导出环岛人行横道的行人限流措施。

关 键 词：ROUNDABOUT pedestrian-vehicle conflicts fuzzy inference system fuzzy cellular automata model pedestrian restriction measure 

分 类 号：U491[交通运输工程—交通运输规划与管理]