Determining Skid Resistance Needs on Horizontal Curves for Different Levels of Precipitation
Determining Skid Resistance Needs on Horizontal Curves for Different Levels of Precipitation
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DOI：
10.1177/0361198120929334
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发表时间：
2020-07-12
影响因子：
1.7
通讯作者：
Lord, Dominique
中科院分区：
文献类型：
--
作者：
Geedipally, Srinivas R.;Das, Subasish;Lord, Dominique
水平弯道是导致致命和重伤的撞车事故的主要原因。人们对曲线的几何特征和交通特征的安全影响进行了大量的研究。描述曲线几何形状和速度的变量已被纳入安全预测方法。然而，关于路面摩擦和天气数据对安全的影响的研究相对较少。这项研究的目的是开发一种确定不同降雨量所需路面摩擦的方法。为了完成研究目标，我们使用了德克萨斯州的乡村双车道、四车道不分线和四车道分线水平曲线数据。建立了包括交通和几何特征、打滑次数和年降雨率在内的安全预测模型。然后，这些模型被用来制定评估感兴趣曲线的安全性能的指南，方法是考虑曲线几何形状、路面防滑和暴露在与防滑考虑最相关的潮湿天气条件下。为了进行规划水平的分析，以确定路面摩擦处理的候选地点，研究人员根据打滑次数和年降雨量变量的综合影响制定了阈值。研究人员还为两个年降雨量有显著差异的示例地点提供了高优先级地点的打滑次数阈值。
Horizontal curves are a major cause of crashes that lead to fatal and serious injuries. Much research has been conducted on the safety implications of geometric and traffic characteristics of curves. Variables describing curve geometry and speed have been incorporated into safety prediction methodologies. However, relatively less research has been conducted on the effects of pavement friction and weather data on safety. The objective of this study is to develop a methodology for determining the pavement friction needs for different levels of precipitation. To accomplish the study objective, rural two-lane, four-lane undivided, and four-lane divided horizontal curve data from Texas were used. Safety prediction models were developed that included traffic and geometric characteristics, skid number, and annual precipitation rate. These models were then used to develop the guidelines for assessing the safety performance of a curve of interest by accounting for curve geometry, pavement skid resistance, and exposure to the wet-weather conditions that are most relevant for considerations of skid resistance. For conducting a planning-level analysis to identify candidate sites for pavement friction treatments, researchers developed thresholds based on the combined effect of skid number and annual precipitation variables. Researchers also provided skid number thresholds for high-priority sites for two example locations that experience significantly different levels of annual precipitation.