Driving Safety Evaluation Method for Continuous Downhill Section of Mountainous Expressway Based on Longitudinal-Transverse Combination

doi:10.3969/j.issn.1674-0696.2024.05.11

Abstract

Abstract: Subjected to geographical and economic constraints, the construction of mountainous expressways inevitably involves continuous downhill sections, among which the longitudinal-transverse combination section places higher demands on vehicle stability and safety. In order to analyze the driving safety in continuous downhill sections of mountainous expressways, a driving simulation experiment was constructed at a design speed of 80km/h at different positions and under different longitudinal-transverse combination conditions in a continuous downhill section by utilizing the data from a southwestern mountainous expressway. The comprehensive evaluation index was derived according to psychological data of drivers, vehicle speed variation data and lateral deviation data. Subsequently, a correlation analysis between the comprehensive evaluation index and the horizontal curve radius and longitudinal slope was carried out. Then, the threshold value was divided and evaluated through the cumulative frequency graph. A driving safety evaluation method for continuous downhill sections based on longitudinal-transverse combinations was proposed, and based on the proposed evaluation method, the recommended values for the longitudinal-transverse combinations design at the crest, middle, and bottom of slope of the continuous downhill section were proposed. Finally, the proposed evaluation method was applied and validated by taking a certain expressway in the southwestern mountainous region as an example. The research results indicate that the proposed method can serve as an effective reference for evaluating the driving safety of continuous downhill sections of expressways.

Key words: highway engineering; continuous downhill of expressway; longitudinal-transverse combination; driving safety; evaluation method

摘要： 受制于地理和经济条件，山区高速公路在建设中不可避免会存在连续下坡路段，其中平纵组合路段对车辆稳定性和安全性提出了更高的要求。为分析山区高速公路连续下坡平纵组合路段的行车安全，利用西南山区高速公路数据，以80 km/h的设计速度，在连续下坡路段的不同位置、不同平纵组合工况构建了驾驶仿真实验。根据驾驶者的心理数据、车辆速度变化数据和横向偏移数据推出综合评价指标；将综合评价指标与平曲线半径和纵坡进行相关性分析；再通过累计频率图划分评价阈值；提出了基于平纵组合的连续下坡路段行车安全评价方法，并依托评价方法提出了连续下坡路段坡顶、坡中和坡底位置的平纵组合设计建议值；并以西南山区某高速公路为例对该评价方法进行了应用与验证。研究结果表明：该方法能为高速公路连续下坡路段的行车安全评价提供有效的参考依据。

关键词: 道路工程；高速公路连续下坡；平纵组合；行车安全；评价方法

CLC Number:

U412.3

ZHANG Chi1,2, WANG Xiru1, XIANG Yujie3, GAO Yanyang1, RAN Guangjiong4. Driving Safety Evaluation Method for Continuous Downhill Section of Mountainous Expressway Based on Longitudinal-Transverse Combination[J]. Journal of Chongqing Jiaotong University(Natural Science), 2024, 43(5): 78-90.

张驰1,2，王茜茹1，向宇杰3，高艳阳1，冉光炯4. 基于平纵组合的山区高速公路连续下坡路段行车安全评价方法[J]. 重庆交通大学学报（自然科学版）, 2024, 43(5): 78-90.

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