Modeling of a Novel Risk Index for Evaluating the Geometric Designs of Roundabouts
Modeling of a Novel Risk Index for Evaluating the Geometric Designs of Roundabouts
复制标题
用于评估环岛几何设计的新型风险指数建模
DOI：
10.1016/j.aap.2020.105702
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发表时间：
2020
影响因子：
5.9
通讯作者：
H
中科院分区：
文献类型：
--
作者：
Yoshioka;K.;Nakamura;H.;Shimokawa;S. and Morita;H
在环形交叉口的几何设计中，需要以安全为导向的方法，而不是简单地确定几何结构元素的尺寸的规范设计方法。本文提出了一种结合不可见性概率和碰撞冲击的风险指数(RI)作为评价环形交叉口几何设计安全性的性能指标，并描述了该指数的计算方法。不可见概率表示进入的车辆不能在循环车道上看到来自上游的车辆的概率，碰撞影响表示碰撞时损失的动能与碰撞的影响相对应的量。在此基础上，进一步给出了基于各种几何条件的数值模拟方法。结果表明，当入射角较小时，隐身概率较大，偏角越小，碰撞冲击越大。预计建议的方法将有助于解决现有环形交叉口的问题，并改善未来环形交叉口的设计，以提高其安全性能。
In the geometric design of roundabouts, safety-oriented approaches are required rather than specification design ones that simply determine the dimensions of the geometric structural elements. We herein propose a risk index (RI) that combines the invisibility probability and the crash impact as a performance measure for evaluating the safety of the geometric designs of roundabouts, and we also describe a method for calculating this index. Invisibility probability represents the probability that an entering vehicle cannot view a vehicle coming from the upstream in a circulatory roadway and crash impact represents the amount of lost kinetic energy at the time of collision corresponds to the impact of the crash. A numerical simulation to model this RI on the basis of various geometric conditions is further presented. It is demonstrated that the invisibility probability is large when the entry angle is small and that the crash impact increases when the deviation angle decreases. The proposed approach is expected to help resolve issues with currently existing roundabouts and improve the design of future roundabouts to enhance their safety performance.