中文摘要：

为了对信号交叉口上游车辆换道行为进行分析，以元胞自动机交通流理论为基础，结合自由换道模型及强制换道模型提出了进口道附近路段的综合换道模型，并对原有强制换道模型进行改进．通过对综合换道模型进行模拟，得出进口道附近交通流的时空关系及密度关系图．模拟结果表明，车流密度在[0，0．2]及[0．4，0．6]范围时，进口道换道率变化率较高；同时在中低密度下，随着换道率的增加，平均车速逐渐降低，但在高密度下，车速随换道率变化并不显著．

英文摘要：

In order to analyze the lane-changing behavior on the upstream of the intersections, based on the cellular automata traffic theory, a comprehensive lane-changing model for the traffic flow near the approach is proposed by combining the improved mandatory lane-changing model and discretionary lane-changing model. And the charts describing the scenarios of the space-time and traffic density for the traffic flow near the approach are obtained through simulation based on the comprehensive lane-changing model. Results show that the lane-changing rate at the approach is higher when the traffic density is in the ranges of [0, 0.2] and [0.4, 0.6]. The average vehicle speed is gradually reduced as lane-changing rate increases under median iow vehicle stream density, but the variation of vehicle speed with lane-changing rate is not significant under high vehicle stream density.