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城市快速路交织区的换车道行为是通行能力损失的重要原因,常常导致降低道路的安全等级。以往研究证实换车道行为对交通流的特性具有重要影响,但缺乏量化实证分析。通过对给定交通条件和道路条件的成都市城市快速路交织区4级服务水平上半部状态(设计速度为60km/h,v/c值为0.81～1.0,密度≤42pcu/(km.ln))下的4个观测点的5min间隔内速度、换车道次数、密度的实测数据进行统计分析,在此基础上,建立了不同车道上换车道次数与速度和交通流密度之间的系列最优拟合模型,并将拟合效果与现有模型效果进行了比对,认为文中提出的拟合模型更适合描述4级服务水平上半部下城市快速路交织区的交通流特性。
Lane changing at the city expressway intertwining zone is an important cause of lost capacity and often leads to a reduction of the road safety level. Previous studies have confirmed that lane changing has an important impact on the characteristics of traffic flow, but lack of quantitative empirical analysis. Based on the upper half of service level 4 of Chengdu Expressway Interchange at given traffic conditions and road conditions (design speed of 60km / h, v / c of 0.81-1.0, density ≤ 42pcu / (km.ln )) Of the four observation points within 5min interval speed, lane change number and density of the measured data for statistical analysis, on this basis, the establishment of a different lanes lane number and speed and traffic flow between the series The fitting model is better than the existing model. The fitting model proposed in this paper is more suitable for describing the traffic flow characteristics of the urban expressway weaving area in the upper half of the service level 4.