市政技术2026，Vol.44Issue(3)：9-21,174,14.DOI:10.19922/j.1009-7767.2026.03.009
城市互通左侧合流区交通运行状态及几何尺寸研究
Study on Traffic Operation Status and Geometric Dimensions of Left Merging Zones at Urban Interchanges
摘要
Abstract
In some cities,the road interchange construction is constrained by land use restrictions.Adopting a left-entry configuration can avoid land use limitations,reduce project costs,and minimize unnecessary detours.Howev-er,there are few provisions for the layout and minimum length of left-entry acceleration lanes in relevant current Chinese standards.Based on field survey data,this study analyzed the speed characteristics of passenger vehicles at the typical cross-section of acceleration lanes in left-entry merging zones of urban interchanges,and confirmed that the time headway in the leftmost lane of the main line follows a log-normal distribution.Considering the acceleration behavior,lane-changing patterns,and visual characteristics of passenger vehicles at the tapered section,an opti-mal left-entry acceleration lane configuration was proposed,and an acceleration lane length calculation model was built.Through calibration of key parameters of the acceleration lane length,the minimum recommended length for left-entry acceleration lanes was proposed.The research findings indicate that a parallel configuration is preferable for left-entry acceleration lanes.The minimum length depends not only on the main line design speed but also on the ramp design speed,which should be designed comprehensively by both.关键词
城市道路/左侧入口/加速车道/线形指标/适用性Key words
urban road/left entrance/acceleration lane/linear index/applicability分类
交通工程引用本文复制引用
潘兵宏,陈阳子,王云飞,王家伟,宋瑞华..城市互通左侧合流区交通运行状态及几何尺寸研究[J].市政技术,2026,44(3):9-21,174,14.基金项目
各省级科技专项计划(202007) （202007）
