基于车流波动理论城市快速路匝道间距比例模型研究

城市快速路匝道间距设计是路线设计的重要内容,匝道间距大小和匝道数量对快速路交通流有决定性的影响。当城市快速路处于不间断大交通流量时,车流呈现出较为明显的波动现象。根据城市快速路交通流的这一特点,应用车流波理论,分析了上下匝道间合流区和分流区的车流波特点,进一步建立了出口-入口组合型匝道间距比例数学模型。认为快速路匝道设计不但要考虑间距大小,相邻匝道作为一个整体,还应研究相互之间的影响。实例表明,当匝道间距比例不能满足数学模型时,快速路容易发生交通拥堵,服务水平较低,抗干扰能力较差。

The research of urban expressway on-ramp spacing ratio model Based on traffic wave theory

Urban expressway on-ramp spacing design is an important part of the route design, size and number of ramp ramp spacing has a decisive influence on expressway traffic flow. When the large urban expressway in uninterrupted traffic flow, traffic present a more obvious fluctuations. According to the characteristics of urban expressway traffic flow, traffic flow wave theory, analyzes the confluence area between up and down the ramp and the triage area traffic potter points, further establish the export - entrance ramp spacing ratio combination of mathematical model. Think expressway ramp design size, not only should consider spacing should be adjacent ramp as a whole, study the effect of each other in size. Instances show that when the proportions of the ramp spacing can"t satisfy the mathematical model of expressway are prone to traffic congestion, service level is low, poor anti-interference ability.