Spatial andtemporal evolution of rear-end conflict risk at sharp curves using vehicle trajectory data

被引：0
|
作者：
Wang Y. [1 ,2 ]
Li X. [1 ]
Song J. [1 ]
Li D. [1 ]
机构：
[1] School of Transportation Engineering, Chang′an University, Xi′an
[2] Key Laboratory of Transport Industry of Management, Control and Cycle Repair Technology for Traffic Network Facilities in Ecological Security Barrier Area, Chang′an University, Xi′an
来源：
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | / 56卷 / 03期
关键词：
derivative of PET (DPET); post encroachment time (PET); rear-end conflict risk; sharp curves; spatial and temporal evolution; vehicle trajectory;
D O I：
10.11918/202207089
中图分类号：
学科分类号：
摘要：
In order to reveal the formation and change of rear-end collision risk between the lead and following vehicles on sharp curves effectively, a typical accident-prone sharp curved segment is selected to collect traffic flow data by vertical aerial photography from unmanned aerial vehicles. Vehicle trajectory information is extracted via Tracker to determine the post-encroachment time (PET) variable of rear-end conflict cross the sharp curve. The results show that there is a spatial clustering feature in rear-end conflicts, which mainly concentrate in the upstream of the entry transition curve and the downstream of the circular and exit transition curves. Four types of rear-end conflicts make up 83. 24% of all types of conflicts, and PET decreases both at threshold moment and within conflict risk range with the former is even more so than the latter, resulting in declines of DPET (derivative of PET) values. Also, four indicators as speed of FV, acceleration, difference in speed and acceleration between LV and FV have a significant impact on the DPET change at the threshold moment of rear-end conflicts. The mean value of DPET during the conflict evolution process of T10 (LV decelerates and FV accelerates) is the smallest with the PET sequence declines most sharply, which shows a significantly higher risk than other conflict modes. © 2024 Harbin Institute of Technology. All rights reserved.
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页码：38 / 45
页数：7
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