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以NaSch模型为基础建立设置U形转向的路段交通流模型,对其特性进行模拟分析.结果表明,U形转向路口对交通流影响显著,会导致在较小进车概率时发生自由流状态到拥挤状态的相变,相应的临界流量也随之降低.设置双U形转向系统的相变、临界流量等交通流特性与单转向系统具有明显差异,其系统效率较高.在实际交通规划与管理时应避免设置单转向系统,以减小U形转向的负面影响.
Based on NaSch model, the traffic flow model of U-turn road section is established and its characteristics are simulated.The results show that U-turn junction has significant influence on traffic flow, which leads to the occurrence of free flow state The phase transition of the crowded state and the corresponding critical flow rate also decrease.With the characteristics of double-U-turn system such as phase transition and critical flow, the traffic flow characteristics are obviously different from that of the single-steering system and the system efficiency is higher.In the actual traffic planning and The management should avoid setting single steering system to reduce the negative impact of U-turn.