Abstract: Based on the coil data and videos of traffic flow at two ramp merging areas on Yanan expressway in Shanghai, the traffic flow parameters of the main line and the inflow vehicles were extracted, the different effects of the conditions with or without the lane balance design on the traffic flow operation at ramp merging areas on urban expressway were compared and analyzed. The inherent mechanism of the lane balance design affecting traffic operation at ramp merging areas was analyzed, and the limitations and countermeasures of the existing lane balance design were discussed. The results show that the lane balance design can significantly reduce vehicle lane-changing and speed-changing behavior, and play a positive role in improving the capacity of ramp merging areas, improving the operation speed and maintaining the traffic flow stability. However, the proposed design cant be simply applied, and it is necessary to take into account all kinds of actual situations and make pertinent analysis and design.

Key words: traffic and transportation engineering, lane balance design, data analysis, urban expressway, ramp merging area, traffic operation

摘要： 基于上海延安高架两个匝道合流区的线圈数据和视频，对主线和汇入车辆的交通流状况进行参数提取，对比分析了有无车道平衡设计 对城市快速路匝道合流区交通流运行所产生的不同影响，解析了车道平衡影响匝道合流区交通运行的内在机理，探讨了现有车道平衡设计存 在的局限及对策。结果表明:车道平衡设计能大幅减少车辆的换道和变速行为，对提升匝道合流区通行能力，提高运行速度，维持交通流稳 定都具有积极作用，但不能简单采用,而需要综合考虑各种实际情况,进行针对性分析与设计。

关键词: 交通运输工程, 车道平衡设计, 数据分析, 城市快速路, 匝道合流区, 交通运行