City-wide traffic control: Modeling impacts of cordon queues
City-wide traffic control: Modeling impacts of cordon queues
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DOI：
10.1016/j.trc.2019.04.024
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发表时间：
2020-04
期刊：
影响因子：
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通讯作者：
Wei Ni;M. Cassidy
中科院分区：
文献类型：
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作者：
Wei Ni;M. Cassidy
最佳的警戒线计量率得到使用宏观基本图结合流量守恒定律。还使用模型预测控制算法，以便根据其预测影响生成时变计量率。我们的可扩展算法可以为城市内任意数量的警戒区做到这一点。与其前辈不同，该模型考虑了警戒线队列对街区循环交通的时变约束效应，因为这些队列会随着时间的推移而扩展和后退。该模型这样做，在每一个时间步近似一个街区的街道空间所占用的警戒线队列，并重新缩放的MFD来描述状态的循环交通的结果。该模型还区分饱和和欠饱和警戒线计量操作。一个理想化的网络的计算机模拟表明，这些增强功能可以大大提高预测，在一个街区的行程完成率和速度，车辆越过计量警戒线。结果表明，最佳的计量策略在减少网络上行驶的车辆小时数方面做得更好。VHT减少所提出的模型和它的前身相差高达14%。
Optimal cordon-metering rates are obtained using Macroscopic Fundamental Diagrams in combination with flow conservation laws. A model-predictive control algorithm is also used so that time-varying metering rates are generated based on their forecasted impacts. Our scalable algorithm can do this for an arbitrary number of cordoned neighborhoods within a city. Unlike its predecessors, the proposed model accounts for the time-varying constraining effects that cordon queues impose on a neighborhood’s circulating traffic, as those queues expand and recede over time. The model does so at every time step by approximating a neighborhood’s street space occupied by cordon queues, and re-scaling the MFD to describe the state of circulating traffic that results. The model also differentiates between saturated and under-saturated cordon-metering operations. Computer simulations of an idealized network show that these enhancements can substantially improve the predictions of both, the trip completion rates in a neighborhood and the rates that vehicles cross metered cordons. Optimal metering policies generated as a result are similarly shown to do a better job in reducing the Vehicle Hours Traveled on the network. The VHT reductions stemming from the proposed model and from its predecessors differed by as much as 14%.