最大当量排队长度模型及其时空特性

为描述最大排队长度的时空特性,基于单车道路段当量排队长度模型,推导出最大当量排队长度模型.运用数理统计方法分析最大当量排队长度的交通流特性、时间特性与空间特性.使用偏微分方法求解各个影响因素对最大当量排队长度的灵敏度.结果显示:最大当量排队长度对路段长度最为敏感,其次为滞留车辆数,对到达车流量、周期时长或绿信比的敏感程度均取决于另外两个变量.研究表明在交通控制系统中应优先协调短连线以避免交通多米诺效应;考虑不同园素对最大当量排队长度的影响特性,可以为优化或调整信号控制方案提供理论依据.

Maximum equivalent queue length model and time-space characteristics

To describe the time-space characteristics of maximum queue length, the maximum equivalent queue length model was deduced according to the equivalent queue length model for one-lane link. The traffic flow characteristics, the time characteristics and the space characteristics were analyzed by applying the statistics method. The sensitivity of maximum equivalent queue length to every parameter was solved by using partial differential operation. The results indicate that the maximum equivalent queue length is most sensitive to the length of link, more sensitive to the blocked vehicle number, and the sensitive extent to the vehicular arrival volume, the cycle length and the green ratio lies on the other two variables. The study results prove that short links should be coordinated in traffic control system preferentially for preventing the domino effect. The characteristics that different factors have an effect on the maximum equivalent queue length can provide the theoretical basis for optimizing or adjusting signal control scheme.