双向四车道高速公路出口减速换道视距探讨  

Discussions on Sight Distance for Lane-Changing Deceleration at Exit of Dual 2-lane Expressway

作　　者：屈强[1] 张朝辉[1] 吴明先[1] 闫雯倩[1] QU Qiang;ZHANG Zhao-hui;WU Ming-xian;YAN Wen-Qian(CCCC First Highway Consultants Co.Ltd.,Xi'an 710075,China)

机构地区：[1]中交第一公路勘察设计研究院有限公司,西安市710075

出　　处：《公路》2022年第5期46-51,共6页Highway

摘　　要：对识别视距和双向四车道高速公路最不利车道横净距进行分析后,利用视距简化公式推算出双向四车道高速公路互通式立交出口识别视距所需圆曲线最小半径。通过对高速公路互通式立交出口驶出车辆的行驶规律和高速公路出口交通事故机理进行分析后,提出了“减速换道视距”的新概念,分析了减速换道的原理和数值推算过程,确定减速换道视距一般值为300 m、最小值为150 m。根据横净距及简化公式计算得出双向四车道高速公路左转曲线和右转曲线减速换道视距所需的圆曲线最小半径,给出了高速公路出口圆曲线最小半径建议值。研究结果可供技术探讨和研究参考,以期有助于分析高速公路互通式立交出口的视距需求和交通安全管理。Based on analysis of identifiable sight distance and the lateral clear distance of curve of the most driver-unfriendly lane on dual 2-lane expressways, in the paper the minimal radius of the circular curve required by identifiable sight distance at an exit of the interchange junctions of a dual 2-lane expressway is calculated. In addition, upon analysis of the driving law of outbound vehicles at the exits of interchange junctions of expressways and the mechanism of traffic accidents at expressway exits, the new concept of “lane-changing deceleration sight distance” is put forward. Through analyzing the fundamentals of lane-changing deceleration and the process of relevant calculation, it is concluded that the average lane-changing deceleration sight distance is 300 m and the minimal lane-changing deceleration sight distance 150 m. Based on the lateral clear distance of curve and relevant reduction formula, the minimal radius of the circular curve required by lane-changing deceleration sight distance of the left-turning and right-turning curves on dual 2-lane expressways is also calculated, and the recommended value for the minimal radius of the circular curve at expressway exits is recommended.The technical exploration and studies in the paper is conducive to promote research on sight distance requirements and traffic safety management at interchange junctions of expressways.

关 键 词：双向四车道高速公路 互通式立交 出口 识别视距 减速换道视距 圆曲线最小半径 

分 类 号：U415.352[交通运输工程—道路与铁道工程]