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Development of a variable speed limit strategy to reduce secondary collision risks during inclement weathers

机译：制定变速策略以减少恶劣天气下的二次碰撞风险

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摘要

Inclement weather reduces traveler's sight distance and increases vehicle's stopping distance. Once a collision occurred during inclement weather and resulted in a slow traffic, approaching vehicles may not have adequate time to make emergency responses to the hazardous traffic, resulting in increased potentials of secondary collisions. The primary objective of this study is to develop a control strategy of variable speed limits (VSL) to reduce the risks of secondary collisions during inclement weathers. By analyzing the occurrence condition of secondary collision, the VSL strategy is proposed to dynamically adjust the speed limits according to the current traffic and weather conditions. A car-following model is modified to simulate the vehicle maneuvers with the VSL control. Two surrogate safety measures, based on the time-to-collision notion, are used to evaluate the control effects of VSL. Five weather scenarios are evaluated in simulation. The results show that the VSL strategy effectively reduces the risks of secondary collisions in various weather types. The time exposed time-to-collision (TET) is reduced by 41.45%-50.74%, and the time integrated time-to-collision (TIT) is reduced by 38.19%-41.19%. The safety effects are compared to those with a previous VSL strategy. The results show that in most cases our strategy outperforms the previous one. We also evaluate how driver's compliance to speed limit affects the effectiveness of VSL control.
机译：恶劣天气会减少旅行者的视线距离，并增加车辆的停车距离。一旦在恶劣天气中发生碰撞并导致交通缓慢，接近的车辆可能没有足够的时间对危险交通做出紧急响应，从而增加了二次碰撞的可能性。这项研究的主要目的是开发一种可变速极限（VSL）的控制策略，以减少恶劣天气期间二次碰撞的风险。通过分析二次碰撞的发生情况，提出了VSL策略，根据当前的交通和天气情况动态调整限速。修改了跟车模型，以使用VSL控件模拟车辆操纵。基于碰撞时间的概念，有两种替代安全措施用于评估VSL的控制效果。仿真中评估了五种天气情况。结果表明，VSL策略可有效降低各种天气类型下二次碰撞的风险。暴露时间的碰撞时间（TET）降低了41.45％-50.74％，时间综合碰撞时间（TIT）降低了38.19％-41.19％。将安全效果与以前的VSL策略进行比较。结果表明，在大多数情况下，我们的策略要优于上一个。我们还评估了驾驶员遵守速度限制的方式如何影响VSL控制的有效性。

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  • 来源
    《Accident Analysis & Prevention》 |2014年第11期|134-145|共12页
  • 作者

    Zhibin Li; Ye Li; Pan Liu; Wei Wang; Chengcheng Xu;

  • 作者单位

    Jiangsu Key Laboratory of Urban ITS, Southeast University, 2 Si Pai Lou, Nanjing 210096, China,Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies, 2 Si Pai Lou, Nanjing 210096, China;

    Jiangsu Key Laboratory of Urban ITS, Southeast University, 2 Si Pai Lou, Nanjing 210096, China,Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies, 2 Si Pai Lou, Nanjing 210096, China;

    Jiangsu Key Laboratory of Urban ITS, Southeast University, 2 Si Pai Lou, Nanjing 210096, China,Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies, 2 Si Pai Lou, Nanjing 210096, China;

    Jiangsu Key Laboratory of Urban ITS, Southeast University, 2 Si Pai Lou, Nanjing 210096, China,Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies, 2 Si Pai Lou, Nanjing 210096, China;

    Jiangsu Key Laboratory of Urban ITS, Southeast University, 2 Si Pai Lou, Nanjing 210096, China,Jiangsu Province Collaborative Innovation Center of Modern Urban Traffic Technologies, 2 Si Pai Lou, Nanjing 210096, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Variable speed limit; Strategy; Secondary collision; Safety; Inclement weather;

    机译：变速极限;战略;二次碰撞;安全;恶劣天气;

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