城市快速路出口匝道瓶颈区域交通流率特征研究

Research on Traffic Flow Rate Features at Urban Expressway Bottleneck Near Off-ramp

分析城市快速路出口匝道附近的交通流率特征,对确定通行能力和提出管理措施具有重要意义.针对城市快速路线圈检测数据,利用方差分析和配对样本检验分析比较出口匝道瓶颈区域各车道之间交通拥挤前后的流率变化.发现内侧车道的交通流率在拥挤之前低于外侧车道,而在拥挤期间高于外侧车道.外侧车道在拥挤之后的排队消散流率会显著降低,而内侧车道的消散流率反而增加,即存在早发性交通拥挤的现象,并通过流量-速度关系图对内外车道交通流特征的差异进行阐释.

It’s significant to analyze the characteristics of traffic flow rate at urban expressway bottle‐neck near off‐ramp w hen determining road capacity and proposing traffic management measures .Based on loop detector data ,one‐way ANOVA （Analysis of Variance） and paired samples test are used to analyze the changes of traffic flow rate in each lane of an urban expressway bottleneck near off‐ramp when the traffic congestion occurs .It shows that the pre‐queue flow of inside lanes are lower than outside lanes’ before traffic congestion ,but higher than outside lanes’ during traffic congestion peri‐od .And the queue discharge flow of outside lanes will significantly reduce after congestion ,but inside lanes’ will significantly improve which means that the inside lanes experience an early‐onset of traffic congestion .Furthermore ,the flow‐velocity diagrams are used to explain the differences of traffic flow features between inside and outside lanes .