Investigation of Centroid Connector Placement for Advanced Traffic Assignment Models with Added Network Detail
Investigation of Centroid Connector Placement for Advanced Traffic Assignment Models with Added Network Detail
复制标题
添加网络详细信息的高级流量分配模型的质心连接器放置研究
DOI：
10.3141/2498-03
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发表时间：
2015
影响因子：
1.7
通讯作者：
J. Duthie
中科院分区：
文献类型：
--
作者：
E. Jafari;Mason D Gemar;N. R. Juri;J. Duthie
先进的交通分配模型，如基于仿真的动态交通分配，通常包含更详细的网络表示比传统的规划模型。在这种情况下，质心连接器的位置可能会对模型性能产生重大影响，必须注意其数量和位置，以避免不切实际的拥堵或局部交通对次要道路的低利用率。针对大型区域交通网络中人工检测质心连接点位置可能过于耗时的问题，提出了两种简单的质心连接点自动配置策略.第一种方法将连接器径向分布到最近的节点，并且旨在克服实践中最常见技术的一些限制。第二种策略是将质心和后续需求分为两部分，将需求分布在一个与附近节点相连的子质心和一个与外围节点相连的子质心上，从而有效地建立双层分布。该策略的一个修改涉及消除信号交叉口的节点作为可行的候选连接。作为评估方法的一部分，一个新的度量，地方因素，已被引入到描述当地交通的小街道的使用。在两个真实网络上进行的数值实验，验证了纳入当地街道和质心连接器的位置对模型结果的影响。灵敏度测试和有限的现场数据比较表明，双层质心连接器的位置策略，实现更现实的结果。
Advanced traffic assignment models, such as simulation-based dynamic traffic assignment, typically incorporate more detailed network representations than do traditional planning models. In this context, the placement of centroid connectors may have a significant effect on model performance, and attention must be paid to their number and location to avoid unrealistic congestion or low utilization of minor roadways by local traffic. Given that the manual inspection of centroid connector placement may be too time-consuming in large regional networks, this paper proposes two simple automatic centroid connector placement strategies for dynamic traffic assignment applications. The first approach radially distributes the connectors to the nearest nodes and is intended to exemplify some limitations of the most common techniques in practice. The second strategy involves dividing the centroid and subsequent demand into two parts, distributing the demand across one sub-centroid linked to nearby nodes and one linked to the periphery, and thus effectively establishing a bilevel distribution. A modification of this strategy involves eliminating nodes at signalized intersections as viable candidates for connection. As part of the evaluation of the methods, a new metric, the locality factor, has been introduced to describe the use of minor streets by local traffic. The numerical experiments, conducted on two real-world networks, exemplify the effects of the incorporation of local streets and the placement of centroid connectors on model results. Sensitivity testing and limited field data comparisons suggest that the bilevel centroid connector placement strategy achieves more realistic results.