Extending travel-time based models for dynamic network loading and assignment, to achieve adherence to first-in-first-out and link capacities
Extending travel-time based models for dynamic network loading and assignment, to achieve adherence to first-in-first-out and link capacities
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DOI：
10.1016/j.trb.2014.04.002
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发表时间：
2014-07-01
影响因子：
6.8
通讯作者：
McIvor, Ronan
中科院分区：
文献类型：
--
作者：
Carey, Malachy;Humphreys, Paul;McIvor, Ronan
一类重要的宏观动态网络负载(DNL)和动态交通分配(DTA)模型是基于将路段行程时间视为路段占用率的函数。然而，这些模型存在一些问题或不足，即(A)链路流出可能违反先进先出(FIFO)，(B)链路流出可能超过链路流出容量，(C)链路流入可能超过链路流入容量，以及(D)链路占用可能超过链路占用容量。在本文中，我们介绍了克服这些问题的方法。为了消除问题(A)和(B)，我们扩展了路段行程时间模型，以更好地反映交通流量随时间变化时的行为。为了消除问题(C)和(D)，我们在模型中引入了更多实质性的变化，以引入与模型兼容的容量、溢出和排队。这些扩展加强了路段行程时间模型以及基于它的DNL和DTA模型的现实性、行为基础和可用性。它们没有明显的不利影响或副作用，几乎不需要额外的计算工作。原始模型是新/扩展模型的特例：当且仅当出现问题(A)-(D)中的任何一个时，才激活上述扩展，否则新模型简化为原始模型。(C)2014年提交人。由爱思唯尔有限公司出版。这是一篇在CC by License(http://creativecommons.org/licenses/by/3.0/).下的开放获取文章
An important class of models for macroscopic dynamic network loading (DNL) and dynamic traffic assignment (DTA) is based on treating link travel times as a function of link occupancy. However, these models suffer from some problems or deficiencies namely (a) the link outflows can violate first-in-first-out (FIFO), (b) the link outflows can exceed the link outflow capacities, (c) the link inflows can exceed the link inflow capacities, and (d) the link occupancies can exceed the link occupancy capacities. In this paper we introduce methods to overcome each of these problems. To remove problems (a) and (b) we extend the link travel-time model to better reflect behaviour when traffic flow is varying over time.To remove problems (c) and (d) we introduce more substantial changes in the model, to introduce capacities, spillback and queues compatible with the model. These extensions strengthen the realism, behavioural basis and usability of the link travel-time model and the DNL and DTA models that are based on it. They have no obvious adverse implications or side effects and require little additional computational effort. The original model is a special case of the new/extended model: the above extensions are activated if and only if any of the problems (a)-(d) arise, otherwise the new model reduces to the original model. (C) 2014 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/3.0/).