| 互通立交匝道平曲线内侧停车视距检验与改善 |
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| 引用本文： | 王军,杨勇,孙伟亮.互通立交匝道平曲线内侧停车视距检验与改善[J].厦门理工学院学报,2020,28(3):15-19. |
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| 作者姓名： | 王军 杨勇 孙伟亮 |
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| 作者单位： | （1 安徽省交通规划设计研究总院股份有限公司，安徽 合肥 230088；
2 公路交通节能环保技术交通运输行业研发中心，安徽 合肥 230088） |
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| 摘 要： | 在互通立交匝道平曲线内侧设置护栏，减小了匝道视距横净距，导致运行车辆停车视距不够，威胁行车安全，应将护栏视为视线遮挡物，并进行运行车辆的停车视距检验。可通过匝道视距横净距的计算方法，由已知的横净距，计算出汽车行驶轨迹半径；根据匝道设计速度、实际横净距、停车视距等，计算出匝道在不同设计速度条件下满足视距要求的临界圆曲线半径，并按一般地区对应的停车视距计算确定匝道横净距。已建成的互通立交，若匝道平曲线半径未达到临界值要求，应采取加宽硬路肩、外移护栏等视距改善措施，加宽横净距，或将行驶速度按低一级的设计速度进行合理限制，以提高行车安全性。
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| 关 键 词： | 互通立交匝道 停车视距检验 视距改善 横净距 平曲线半径 |
Inspection and Improvement of Stopping Sight Distance for
Horizontal Curves in Interchanges |
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| WANG Jun,,YANG Yong,,SUN Weiliang ,.Inspection and Improvement of Stopping Sight Distance for
Horizontal Curves in Interchanges[J].Journal of Xiamen University of Technology,2020,28(3):15-19. |
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| Authors: | WANG Jun YANG Yong SUN Weiliang |
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| Affiliation: | (1Anhui Transportation Consulting & Design Institute Company,Hefei 230088,China
2. Road Traffic Energy Conservation and Environmental Protection
Technology Transportation Industry R&D Center,Hefei 230088, China) |
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| Abstract: | Guardrails on the inner side of the horizontal curve on the interchange ramp reduces the on ramp line of sight horizontal clear distance and the stopping sight distance,resulting in threatened driving safety.Guardrail should therefore be regarded as a sight obstruction and inspected as such.Through the calculation of the on ramp line of sight horizontal clear distance,the radius of the car driving trajectory is calculated from the known horizontal clear distance at the same time,minimum values of the on ramp horizontal curve radius that meets the line of sight requirements at varied speeds should be calculated according to speed designed,real clear distance and stopping sight distance,and so are the on ramp horizontal clear distances calculated by areaFor established interchanges with horizontal curve radius failing the minimum value,either the horizontal clear distance should be widened by shoulder widening,guardrail extending or similar measures,or driving speed be reduced to a lower rate so as to improve driving safety at these sites. |
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| Keywords: | interchange ramp stopping sight distance inspection sight distance improvement horizontal clear distance horizontal curve radius |
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