Comparative study on travel time reliability indexes for highway users and operators
Comparative study on travel time reliability indexes for highway users and operators
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DOI：
10.1002/atr.1194
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发表时间：
2012-10
影响因子：
2.3
通讯作者：
H. Wakabayashi;Yukimasa Matsumoto
中科院分区：
文献类型：
--
作者：
H. Wakabayashi;Yukimasa Matsumoto
摘要行程时间可靠性是一种新兴的公路网服务水平评价指标。本文以公路网行程时间可靠性指标为研究对象，提出了一种新的用户行程时间指标。文中还对以往和新提出的几个指标进行了讨论和比较，供公路使用者和运营商使用。由于这一比较研究需要行程时间变化，因此开发了两个用于估计行程时间变化的模型。一种是在需求和服务不确定的情况下估计出行时间变化的多层次随机模型。另一种是利用实际交通检测器数据建立的时间和空间转换模型。在此基础上，提出了新的行程时间可靠性指标。由于公路网运营者对拥堵程度和延误程度感兴趣，因此将以前提出的指标作为运营方指标。然而，高速公路使用者感兴趣的是他们旅行时间的准确性和较早到达目的地的时间。因此，本文提出了用户端索引的概念。基于这些模型的累积分布函数结果，计算行程时间可靠性指标，包括先前提出的指标，并对其进行比较和讨论。在两个部分中，比较了11个具有不同特点的指标。其中一个结果是，这些索引对同一路由具有不同的行为。这表明，了解指数的表述和特点对于根据研究路线的使用目的和特点选择适当的指数是很重要的。另一个重要的结果是，对用户端有用的索引并不总是与操作器端的索引一致。最后，对比研究的结果表明，平均行程时间和合适的行程时间可靠性指标相结合，对于用户和运营商来说都是正确评估路线可靠性的重要因素。版权所有©2012 John Wiley&Sons，Ltd.
SUMMARY Travel time reliability is an emerging evaluation measure for highway network service levels. This paper focuses on travel time reliability indexes for a highway network and proposes new travel time indexes for users. The paper also discusses and compares several previously and newly proposed indexes for use by both highway users and operators. Because this comparative study requires travel time variation, two models are developed for estimating travel time variation. One is the multi-hierarchical stochastic model for estimating travel time variation under uncertainty in demand and service. The other is the temporal and spatial transition model using actual traffic detector data. Then, new indexes for assessing travel time reliability are proposed. Because operators of highway network are interested in the degree of congestion and delay, the previously proposed indexes are regarded as operator-side indexes. The highway users are, however, interested in the accuracy of their travel time and in the earlier arrival at their destination. Thus, this paper proposes the user-side indexes. Travel time reliability indexes, including previously proposed indexes, are calculated on the basis of the cumulative distribution function outcome from these models and are compared and discussed. In two sections, 11 indexes with different characteristics are compared. One of the results is that these indexes behave differently for the same route. This suggests that understanding an index's formulation and characteristics is important for selecting the appropriate index according to both the purpose of use and the characteristics of the study route. Another important result is that indexes useful for the user side do not always agree with the operator-side indexes. Finally, the results of the comparative study suggest that the combination of average travel time and an appropriate travel time reliability index is very important for both users and operators for assessing the route reliability properly. Copyright © 2012 John Wiley & Sons, Ltd.