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。
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 area.For 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.
作者
王军
杨勇
孙伟亮
WANG Jun;YANG Yong;SUN Weiliang(Anhui Transportation Consulting & Design Institute Company,Hefei 230088,China;Road Traffic Energy Conservation and Environmental ProtectionTechnology Transportation Industry R&D Center,Hefei 230088, China)
出处
《厦门理工学院学报》
2020年第3期15-19,共5页
Journal of Xiamen University of Technology
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
interchange ramp
stopping sight distance inspection
sight distance improvement
horizontal clear distance
horizontal curve radius
