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Digital Transportation and Safety 2023年第3期2卷 200-210页

作者： Fuquan Pan Jingzhou Yang Lixia Zhang Changxi Ma Jinshun Yang Pingxia Zhang School of Civil Engineering Qingdao University of TechnologyQingdao 266520China School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China School of traffic and Transportation Lanzhou Jiaotong UniversityLanzhou 730070China

Countdown signals for motorized vehicles,which are intended to ensure safety on the road and regulate motor vehicle speed limits at road intersections,are still considered a relatively novel *** signals have been adopted by only a few countries,and the number of cities that use them is *** review aims to summarize the effects of countdown signals on traffic safety and efficiency and to determine the consistency and differences of existing research propositions on the *** on the review,considerable research presents evidently different conclusions in the areas of driver red-light running and traffic ***,some studies propose that countdown signals reinforce traffic safety,whereas others consider that such signals adversely affect traffic ***,related literature provides varying conclusions on the aspect of traffic efficiency for vehicle *** present,the number of studies conducted regarding the driving behaviors of motorists toward countdown-signalized intersections is ***,such inadequate diversity in research causes difficulty in completely assessing the benefits and disadvantages of countdown *** this paper,an important future research direction on microcosmic driving psychological and physiological data combined with macro-driving behavior is proposed.

关键词： Countdown signals Driving behavior Red-light running traffic safety traffic efficiency

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The Intelligent Control System of traffic Light Based on Fog Computing

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Chinese Journal of Electronics 2018年第6期27卷 1265-1270页

作者： WU Qiong HE Fanfan FAN Xiumei Department of Automation and Information Engineering Xi’an University of Technology

The continuous increase of city motors with the improvement of society has introduced extraordinary demanding situations for the traffic situation of the *** traffic has proposed a diversity of solutions to relieve urban traffic accidents and congestion and other troubles. It cannot regulate the cycle of traffic light in real time in keeping with the occurring traffic flux which additionally, may produce the traffic jam to result in the increase for the range of automobiles and the longer of passage time. In purpose to surmount the shortcomings of traditional traffic light control, this paper is presenting a form of intelligent control system for traffic light founding on fog computing. It calculates and shares the traffic flux situation at the intersection and the surrounding intersection through fog computing platform. Regarding the traffic flow at the intersection and the traffic flow at the surrounding intersection as the parameters, the intelligent control algorithm of traffic light is designed for achieving mutual coordination and mutual influence between different intersections, so that the traffic efficiency of each intersection is improved and the traffic flow of the entire transport network is alleviated. The simulation results showed this intelligent control system progress the traffic efficiency of every intersection and relieve the traffic flow of the whole transport network.

关键词： traffic lights Intersection Fog computing Real-time traffic efficiency

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A Situation-Aware Collision Avoidance Strategy for Car-Following

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IEEE/CAA Journal of Automatica Sinica 2018年第5期5卷 1012-1016页

作者： Li Li Fellow IEEE Xinyu Peng Fei-Yue Wang ieee department of automation bnristtsinghua universityBeijing l00084China the department of automation tsinghua universityBeijing l00084China state key laboratory of management and control for complex systems institute of automationchinese academy of sciencesBeijing 100080China the driver cognition and automated driving laboratory university of waterlooWaterloo N2L 3GlCanada the department of electrical and computer engineering purdue school of engineering and technologyindiana university-purdue university indianapolisIndiana 46202-5l32USA

Abstract--In this paper, we discuss how to develop an appropriate collision avoidance strategy for car-following. This strategy aims to keep a good balance between traffic safety and efficiency while also taking into consideration the unavoidable uncertainty of position/speed perception/measurement of vehicles and other drivers. Both theoretical analysis and numerical testing results are provided to show the effectiveness of the proposed strategy. Index Terms--Collision avoidance, safety, traffic efficiency, uncertainty.

关键词： Collision avoidance safety traffic efficiency uncertainty

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Effects of real-time traffic information systems on traffic performance under different network structures

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Journal of Central South University 2012年第2期19卷 586-592页

作者： YAO Xue-heng F.Benjamin ZHAN LU Yong-mei YANG Min-hua School of Geosciences and Info-Physics Central South University Texas Center for Geographic Information Science Department of GeographyTexas State University-San Marcos

The effects of real-time traffic information system(RTTIS)on traffic performance under parallel,grid and ring networks were *** simulation results show that the effects of the proportion of RTTIS usage depend on the road network *** traffic on a parallel network,the performance of groups with and without RTTIS level is improved when the proportion of vehicles using RTTIS is greater than 0 and less than 30%,and a proportion of RTTIS usage higher than 90%would actually deteriorate the *** both grid and ring networks,a higher proportion of RTTIS usage always improves the performance of groups with and without *** all three network structures,vehicles without RTTIS benefit from some proportion of RTTIS usage in a system.

关键词： real-time traffic information traffic network traffic efficiency optimization of urban traffic

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Integrated Spacing Policy Considering Micro- and Macroscopic Characteristics

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Automotive Innovation 2019年第2期2卷 102-109页

作者： Xinjie Zhang Yiqing Huang Konghui Guo Tao Peng Shengli Sun Wentao Li State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022China Test and Validation Department Engineering Ability Planning SAIC Motor Technical CenterShanghai 201804China College of Mechanical and Electronic Engineering Dalian Minzu UniversityDalian 116600China

An appropriate spacing policy improves traffic flow and traffic efficiency while reducing commuting time and energy *** this paper,the integrated spacing policy that combines the benefits of the constant time headway(CTH)and safety distance(SD)spacing policies is proposed in an attempt to improve traffic flow and ***,the performance of the CTH and SD spacing policies is analyzed from the perspective of the microscopic characteristics of human-vehicle and the macroscopic characteristics of traffic *** switching law between CTH and SD spacing policies and the integrated spacing policy are then proposed to increase traffic efficiency according to the traffic conditions,and the critical speed for the proposed integrated spacing policy is *** the proposed switching law,the integrated spacing policy utilizes the safety redundancy difference between the CTH and SD spacing policies in a flexible *** tests demon-strate that the proposed integrated spacing policy increases traffic flow and that the traffic flow maintains string stability in a wider range of traffic flow density.

关键词： Integrated spacing policy Critical speed Critical traffic flow density String stable traffic efficiency

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Multi-level objective control of AVs at a saturated signalized intersection with multi-agent deep reinforcement learning approach

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Journal of Intelligent and Connected Vehicles 2023年第4期6卷 250-263页

作者： Wenfeng Lin Xiaowei Hu Jian Wang School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin 15000China School of Management Harbin Institute of TechnologyHarbin 15000China

Reinforcement learning(RL)can free automated vehicles(AVs)from the car-following constraints and provide more possible explorations for mixed *** study uses deep RL as AVs’longitudinal control and designs a multi-level objectives framework for AVs’trajectory decision-making based on multi-agent *** saturated signalized intersection is taken as the research object to seek the upper limit of traffic efficiency and realize the specific target *** simulation results demonstrate the convergence of the proposed framework in complex *** prioritizing throughputs as the primary objective and emissions as the secondary objective,both indicators exhibit a linear growth pattern with increasing market penetration rate(MPR).Compared with MPR is 0%,the throughputs can be increased by 69.2%when MPR is 100%.Compared with linear adaptive cruise control(LACC)under the same MPR,the emissions can also be reduced by up to 78.8%.Under the control of the fixed throughputs,compared with LACC,the emission benefits grow nearly linearly as MPR increases,it can reach 79.4%at 80%*** study employs experimental results to analyze the behavioral changes of mixed flow and the mechanism of mixed autonomy to improve traffic *** proposed method is flexible and serves as a valuable tool for exploring and studying the behavior of mixed flow behavior and the patterns of mixed autonomy.

关键词： autonomous vehicles(AVs) mixed autonomy traffic efficiency deep reinforcement learning(RL) saturated signalized intersection

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Effects of Corridor Shapes on Unidirectional Crowd Dynamics

Effects of Corridor Shapes on Unidirectional Crowd Dynamics

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第37届中国控制会议

作者： Xiaoxia Yang Xiaoli Yang Zhenling Wang Yuanlei Kang Institute of Complexity Science Qingdao University Yantai Research Institute China Agricultural University

Different traffic efficiencies of unidirectional pedestrian flows caused by the shapes of corridors evoked much scientific interest in studying unidirectional crowd dynamics. Based on the microscopic continuum method i.e. the improved social force model considering the excitation, the characteristics of unidirectional pedestrian flow through different shapes of corridors which all have the same physical areas are analyzed. In particular, the snapshots of the motion states e.g. "zipper" effect in the bottleneck of corridor and the corresponding trajectories of the unidirectional crowd are simulated and compared, which indicate that pedestrians’ trajectories are indeed related to the shape of corridor. The unidirectional crowd dynamics characterized by three variables, namely the accumulated number of pedestrians leaving the corridor, the mean number of pedestrians in the corridor and the mean speed of the unidirectional crowd, are further focused on. The simulation results reflect that different shapes of corridors proposed in this paper have similar influences on the free walking speed and leaving efficiency. However, under a relatively large inflow, for example, the inflow is 8 p/s, significant effects of different shapes of corridors on the unidirectional crowd dynamics exhibit in the simulation, and jamming occurs more easily.

关键词： unidirectional crowd corridor shape traffic efficiency bottleneck

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