四车道高速公路部分占用超车道交通控制区交通特性及通行能力研究

Traffic Characteristics and Capacity of Overtaking Lane Partly Occupied Traffic Control Zone of Four-lane Freeway

针对四车道高速公路部分占用超车道交通控制区开展研究,得到交通控制区各主要区段行车道和超车道上的流量分布曲线,换道方向与换道率曲线,速度分布曲线,标定Greenshields模型并据此确定各主要区段的道路通行能力.研究结果表明:当交通量处于较低水平时,超车道的利用率较低,只有正常水平的20%左右,此时应对车道划分、车道设置及交通控制方式等进行优化调整;较低交通量水平下,交通控制区的平均车速、运行速度等均较高,宜使用运行速度作为限速值的取值依据;施工作业区段的道路通行能力只有正常路段的89%左右,在保障交通安全的前提下应着力提高瓶颈路段的道路通行能力,并将瓶颈路段的断面通行能力作为是否进行强制分流的依据.

This paper studies the lane utilization rate, traffic flow distribution on the lane, lane changing characteristics, speed characteristics and road capacity of the four-lane freeway traffic control zone which overtaking lane is partly occupied. The flow distribution curve, lane changing direction and lane changing rate curve, and velocity distribution curve of each main section in the carriageway and overtaking lane in the traffic control zone were obtained. The Greenshields model describing the relationship between velocity and flow was calibrated, and the capacity of each main section was determined accordingly. The results show that when the traffic flow is at a low level, the utilization rate of overtaking lane is low, only about 20% of the normal level. At this time, lane division, lane setting and traffic control mode should be optimized and adjusted. At the low level of traffic flow, the average speed and running speed of the traffic control zone are both high, so the running speed should be used as the value of the speed limit value. The capacity of the activity area in the traffic control zone is the lowest, only about 89% of that of the normal section. On the premise of ensuring traffic safety, efforts should be made to improve the capacity of the bottleneck section, and the section capacity should be taken as the basis for determining whether to carry out forced diversion.