Revisiting freeway single tunnel crash characteristics analysis: A six-zone analytic approach
Revisiting freeway single tunnel crash characteristics analysis: A six-zone analytic approach
复制标题
重新审视高速公路单隧道碰撞特征分析：六区分析方法
DOI：
10.1016/j.aap.2020.105542
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发表时间：
2020-07-01
影响因子：
5.9
通讯作者：
Li, Ye
中科院分区：
文献类型：
--
作者：
Pervez, Amjad;Huang, Helai;Li, Ye
对隧道的交通安全进行了大量的研究。然而，在以往的研究中，隧道的进出口部分大多被认为是对称的，隧道的不同长度（长、中、短）没有单独研究。本研究分别考虑隧道入口和出口以及隧道长度的不同，研究高速公路单隧道交通事故的特征。提出了一种六区方法，并应用湖南省156条单隧道的数据进行了安全性分析。比较了传统四区法与该方法在碰撞率、碰撞类型、碰撞促成因素等方面的差异，并对三种不同长度的隧道进行了对比分析。结果表明，所提出的六区方法可以更好地理解隧道的碰撞特性。长隧道、中隧道和短隧道最容易发生碰撞的区域分别是中间区、入口区和通道区。此外，在隧道入口，驾驶员通常没有保持安全距离，导致追尾事故的比例很高，而在隧道出口，驾驶员超速行驶和不适当的变道，增加了侧擦，侧翻和与固定物体碰撞的风险。探讨了不同类型隧道的碰撞发生机理。研究结果对提高高速公路隧道的交通安全具有一定的工程和政策意义。
Considerable studies have been conducted to investigate the tunnels' traffic safety. However, the entrance and exit parts of a tunnel are mostly considered symmetrical in previous studies, and the different lengths (long, medium, and short) of tunnels have not been separately studied. This study aims to investigate the characteristics of traffic crashes in freeway single tunnels by separately considering the entrance and exit of the tunnel as well as the different lengths of tunnels. A six-zone approach is proposed, and the data from 156 single tunnels in Hunan province, China, are applied for safety analysis. The crash rate, crash type, and contributing crash factors are compared between the conventional four-zone approach and the proposed method, and the three types of tunnels with different lengths are also compared for in-depth analysis.Results show that the proposed six-zone method provides a better understanding of the tunnels crash characteristics. The most crash-prone zones for long, medium, and short tunnels are the mid-zone, the entrance zone, and the access zone, respectively. Furthermore, at the tunnel entrance, drivers usually fail to maintain safe distance, which results in the high proportion of rear-end crashes, while at the tunnel exit, they do speeding and improper lane change that increases the risk of sideswipe, rollover, and collision with fixed objects. The study also discusses the crash occurrence mechanism for different types of tunnels. Findings of this study shed some light on the engineering and policy implications for improving traffic safety of the freeway tunnels.