隧道与互通出口小净距路段交通适应性研究

Study on Traffic Adaptability of Tunnel and Interchange Exit Section with Small Clear Distance Based on Aerial Video

为明确隧道与互通出口小净距路段与一般出口路段的交通特性差异性,从定性和定量角度对其进行了分析。通过分析行车过程,对两种路段的交通特性进行了差异比较,进一步定性分析了小净距路段的跟驰特性和换道特性。通过实地调研的视频数据获取了车辆轨迹数据,在此基础上,对比分析了一般出口路段与小净距路段,在分流车变道位置和车头时距的差异。结果表明:相较一般出口路段,小净距出口路段车辆变道位置和车头时距分布存在较大差异。由于小净距路段的有限长度,分流车在变道和驶出时经常表现出更高的难度。有限长度内连续驶出的车辆导致较小车头时距出现的概率增大。此外,传统的车头时距模型与小净距路段实测数据存在显著差异。

To clarify the differences in traffic characteristics between tunnel and interchange exit sections with limited clear zones and general exit sections,both qualitative and quantitative analyses were conducted.By examining the driving process,differences in traffic characteristics of the two types of sections were compared,with a further qualitative analysis on the following and lane-changing behaviors in limited clear zone sections.Using video data from on-site investigations,vehicle trajectory data were collected.Based on this,a comparative analysis was made between general exit sections and limited clear zone sections,focusing on differences in the lane-changing positions of diverging vehicles and headway distribution.The results indicate significant variations in the lane-changing positions and headway distributions between vehicles in limited clear zone exit sections and those in general exit sections.Due to the constrained lengths of limited clear zones,diverging vehicles often exhibit higher difficulty when changing lanes and exiting.The continuous flow of vehicles within limited lengths leads to a higher probability of reduced headway between vehicles.Additionally,traditional headway distribution models show significant discrepancies when compared to the empirical data from limited clear zone sections.