Journal of South China University of Technology(Natural Science) >

2023 , Vol. 51 >Issue 1: 123 - 133

DOI: https://doi.org/10.12141/j.issn.1000-565X.220353

Traffic & Transportation Engineering

Analysis on Propagation of Spatio-Temporal Dynamic Effects Towards Freeway Traffic Crash

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  • 1.School of Transportation Science and Engineering，Beihang University，Beijing 100191，China
    2.Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control，Beihang University，Beijing 100191，China
    3.School of Traffic and Transportation，Beijing Jiaotong University，Beijing 100044，China
杨洋（1988-），男，博士，在站博士后，副研究员，主要从事道路交通安全研究。

Received date: 2022-06-06

  Online published: 2022-10-13

Supported by

the National Key Research and Development Plan(2020YFB1600301);the China Postdoctoral Science Foundation(2021M700333);the Beijing Natural Science Foundation(J210001)

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Abstract

This paper aims to explore and quantify the spatio-temporal propagation mechanism of freeway traffic crashes and address the defect of traditional traffic wave theory considering single dimension in such problems. Firstly, the speed changing before and after the traffic crash was analyzed based on the dynamic traffic flow data collected by microwave radar detectors. Furthermore, the speed changing rate was introduced as a measure of the impact of a crash, the bilinear interpolation method was adopted to construct the speed changing rate curve, and the Savitzky-Golay filtering fitting method was applied to fit the outer contour of the spatio-temporal region affected by the crash. Finally, the indicators of spatio-temporal impacts of traffic crash were figured out and analyzed under the condition that the speed changing rate threshold is 20%, 30% and 40%, respectively. The indicators include the beginning time of the crash effect, the end time of the crash effect, the duration of the crash effect, the closest distance of the crash effect, the furthest distance of the crash effect, the spatial range of the crash effect, the propagation speed of the crash effect and the dissipation speed of crash effect. The results indicate that the smaller the threshold of speed changing rate is, the earlier the crash influence starts, the later the crash influence ends, the longer the duration and the longer the distance of the crash influence has; the higher the speed changing rate threshold is, the later the crash influence starts, the earlier the crash influence ends, the shorter the duration and the shorter the distance of the crash influence have; additionally, under various speed changing rate threshold, the changing trend of propagation speed generated by the traffic crash varies with time. The approach adopted in this paper has strong operability and high identification of results, which can provide theoretical support for real-time traffic control and guidance after freeway crashes.

Key words： freeway; traffic crash; spatio-temporal influence propagation; bilinear interpolation method; Savitzky-Golay filter

Cite this article

YANG Yang, HU Yanran, YUAN Zhenzhou, et al . Analysis on Propagation of Spatio-Temporal Dynamic Effects Towards Freeway Traffic Crash[J]. Journal of South China University of Technology(Natural Science), 2023 , 51(1) : 123 -133 . DOI: 10.12141/j.issn.1000-565X.220353

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