【摘要】 考虑高架路匝道附近的交叉口交通流问题.所采用的模型是经修正的一维管流交通流模型,在运动方程中引入了弛豫项.基于该模型,对上海市内环线的武宁路匝道附近的交通流进行了案例分析,着重对主干道上的右转车辆干扰效应进行了数值模拟,所得结果与实测数据相当符合.分析表明,右转车辆对主干道的“挤压”效应是引起某些交叉口交通拥塞的重要原因,而设置在繁华路口的高架路匝道加剧了这种拥塞状况.更多还原

【Abstract】 Traffic flow at the intersections near the ramps of overhanging freeways was analyzed in this paper. A modified 1-D pipe-flow model was established by introducing a relaxation term in the motion equation. Based on the model, a case study was conducted for the traffic flow at the crossing near the Wuning Road off-ramp of the Inner Ring Freeway in Shanghai City. Numerical simulation was performed with special attention to the disturbing effect of right-turning vehicles from the intersecting main road, the Wuning Road in this case. The obtained results agree quite well with observed data. The analysis shows that the "pin" effect of right-turning vehicles from the intersecting road is the principal cause of congested traffic at certain intersections, and the inappropriate design and construction of ramps in front of busy crossings enhances the congestion.更多还原