基于Panel Data的山地城市立交基本段通行能力影响因素研究

通过统计学分析，基于重庆市主城区不同立交基本段采集的交通流与道路线型等数据，建立Panel Data(面板数据)模型，研究山地城市立交基本段通行能力的主要影响因素，确定通行能力与主要影响因素间的数学关系，对主要影响因素的敏感度排序.结果表明：竖曲线半径、设计速度、圆曲线半径、大车比例是影响山地城市立交基本段通行能力的主要因素，其 中，竖曲线半径对通行能力的影响最大，敏感度最高，为20.66%；道路坡度由于影响权重较小，被大车比例取代.

Interchange Basic Segment Capacity Impact Factor Analysis Based on Panel Data

This study aims to identify the capacity impact factors (CIFs) of basic interchange segments in mountainous cities and examine the co- relation of the major CIFs with the capacity. Using the traffic data and roadway geometric data collected from basic interchange segments located in multiple districts in Chongqing, China, the study conducted statistical analysis and developed a panel data model to describe the relationship of capacity and CIFs. The sensitivity of the CIFs to the capacity of basic interchange segments was analyzed and ranked. The results indicate the major CIFs include radius of vertical curve, design speed, radius of horizontal curve, and heavy vehicle percentage. Among these factors, radius of vertical curve is the most significant CIF, and the sensitivity is up to 20.66%. The roadway grade doesn't appear as a major CIF due to the small impact weight. The heavy vehicle percentage is identified as a major impact factor.