Evaluation of reverse curves focusing on the lateral friction demand on four-lane divided highways

Q1 Engineering

Transportation Engineering Pub Date : 2023-09-01 DOI:10.1016/j.treng.2023.100188

Alireza Aminfar , Amin Mirza Boroujerdian , Arastoo Karimi

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引用次数: 1

Abstract

Horizontal curves on mountainous roads are highly crash-prone and geometric consistency is vital in their design. The drivers' lateral friction demand will be significantly affected if there are a substantial number of successive horizontal curves on these roads due to design limitations. This study is aimed to evaluate the safety of reverse curves using the lateral friction demand as a design criterion. Using a UAV, the required data were collected from ten reverse curves on a mountain highway in Iran for a multiple linear regression model to investigate the effects of geometric variables and speed of vehicles on the average lateral friction demand (f_d,mean). According to the results: (1) the length of the common tangent and the ratio of the curves’ radii affect f_d,mean_, (2) the road longitudinal grade and the vehicle speed have positive effects on f_d,mean, but the curve superelevation affects it negatively and (3) when the length of the common tangent is ≈ 400 m and the curves’ radii are close, the vehicle trajectories are close to the expected trajectory based on the design. These results can help reverse curves to be designed more safely.

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以四车道分隔公路横向摩擦需求为重点的反向弯道评价

山区道路上的平曲线极易发生碰撞，几何一致性在其设计中至关重要。由于设计限制，如果这些道路上有大量连续的水平弯道，驾驶员的横向摩擦需求将受到显著影响。本研究旨在以横向摩擦需求为设计标准来评估反向曲线的安全性。使用无人机，从伊朗一条山区公路上的十个反向弯道收集所需数据，用于多元线性回归模型，以研究几何变量和车辆速度对平均横向摩擦需求（fd，平均值）的影响。结果表明：（1）公切线长度和曲线半径比对fd，mean有影响；（2）道路纵坡和车速对fd，均值有正向影响，但曲线超高对其有负向影响；（3）当公切线长度≈400m且曲线半径接近时，车辆轨迹接近基于设计的预期轨迹。这些结果可以帮助更安全地设计反向曲线。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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