On the role of speed adaptation and spacing indifference in traffic instability: Evidence from car-following experiments and its stochastic model

被引:57
作者
Tian, Junfang [1 ]
Zhang, H. M. [2 ]
Treiber, Martin [3 ]
Jiang, Rui [4 ]
Gao, Zi-You [4 ]
Jia, Bin [4 ]
机构
[1] Tianjin Univ, Coll Management & Econ, Inst Syst Engn, 92 Weijin Rd, Tianjin 300072, Peoples R China
[2] Univ Calif Davis, Dept Civil & Environm Engn, Davis, CA 95616 USA
[3] Tech Univ Dresden, Inst Transport & Econ, Wurzburger Str 35, D-01062 Dresden, Germany
[4] Beijing Jiaotong Univ, Key Lab Transport Ind Big Data Applicat Technol C, Minist Transport, Beijing 100044, Peoples R China
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
Car following; Stochasticity; Speed adaptation; Spacing indifference; Traffic oscillation; CONCAVE GROWTH-PATTERN; CELLULAR-AUTOMATON MODEL; PHASE-TRANSITIONS; STATES; FEATURES; BEHAVIOR; IMPACTS; FLOW;
D O I
10.1016/j.trb.2019.09.014
中图分类号
F [经济];
学科分类号
02 ;
摘要
Understanding the mechanisms responsible for the emergence and evolution of oscillations in traffic flow has been a subject of intensive research by numerous scholars. In our previous work, we proposed a new mechanism to explain the generation of traffic oscillations: traffic instability caused by the competition between speed adaptation and stochastic effects. By conducting a closer examination of car following data obtained in a 25-car platoon experiment, we discovered in this work that the speed difference plays a more important role on car-following dynamics than the spacing, and when its amplitude is small, the growth of oscillations is mainly determined by the stochastic factors that follow the mean reversion process; when its amplitude increases, the growth of the oscillations is determined by the competition between the stochastic factors and the speed difference. An explanation is then provided, based on the above findings, to why the speed variance in the oscillatory traffic grows in a concave way along the platoon. We also proposed a mode-switching stochastic car-following model that incorporates the speed adaptation and spacing indifference behavior of drivers, which captures the observed characteristics of oscillation and discharge rate. Finally, our sensitivity analysis shows that the influence on oscillation growth and discharge rate is small by the reaction delay but large by the indifference region boundary. (C) 2019 Published by Elsevier Ltd.
引用
收藏
页码:334 / 350
页数:17
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