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原文传递 Development of a Surrogate Conflict for Freeway Exits Using Trajectory Data

题名：	Development of a Surrogate Conflict for Freeway Exits Using Trajectory Data
正文语种：	中文
作者：	Tangyi Guo Xuejiao Jiang Wei Fan
作者单位：	School of utomation,Nanjing University of Science & Technology ＃ 200 Xiao Ling Wei,Nanjing 210094, hina epartment of ivil and Environmental Engineering The University of North arolina at harlotte harlotte, N 8223, US
关键词：	Conflict surrogate safety indicator trajectory freeway exit
摘要：	Crash occurrences are random rare events which are difficult to detect and reconstruct.Evaluating traffic safety using crash surrogate measures instead of historical crash data is attracting more and more attention.The trajectory, a continuous function of a vehicle's temporal-spatial kinestate, is capable of depicting the process of crash potentials by means of theoretical analysis or simulation.The trajectory provides easy access to accurate calculation of the commonly used safety surrogate indicators like TTC and PET, which are difficult to obtain in practice.TTC and PET are the time differences between two vehicles during a quasi accident process.Compared with the situation in the final conflicting point, two vehicles may encounter a smaller distance or a bigger speed variation while approaching the conflict point.TTC and PET are deficient in describing abreast driving, or distinguishing the severity levels for approximately equal TTC (PET) cases.To remedy these shortcomings, this paper proposes a surrogate indicator Kj, the ratio of conflicting distance divided by relative speed.And an exponential model is developed to predict the conflict probability.Kj and the conflict probability are both time frame based, illustrating the changing process at each time frame during a conflict phase.The indicator Kj and conflict probability make it easier to describe the conflict mechanism and distinguish the levels of conflict severity.
会议日期：	201511
会议举办地点：	成都
会议名称：	2015第二届智能交通国际会议
出版日期：	2015-10-31
母体文献：	2015第二届智能交通国际会议论文集