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Cronbach's coefficient as a performance measure to assess link-level reliability.

机译：Cronbach系数作为评估链路级可靠性的性能度量。

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摘要

Travel time reliability is commonly used in reference to the level of consistency in transportation service for a trip, corridor, mode or route in terms of its travel time. Typically, reliability is viewed by motorists in relation to their past experience and helps them assess their expected future trip travel time. With increasing congestion levels in most of the urban areas, there is a need to at least be aware of when and where the congestion occurs, thereby, enabling a motorist to estimate the probable travel time as closely as possible.;This research proposes and demonstrates the use of Cronbach coefficient, 'alpha' (a two-dimensional measure) as a performance measure complementing the traditional indicators to assess link-level reliability. INRIX travel time data of Charlotte, Mecklenburg County, North Carolina, for the years 2009 and 2010, were used in the current research. Most reliable travel time values for each link is determined, while also classifying the link-level performance into different levels of reliabilities using the scores that are evaluated in this research. Results from this research indicate that categorizing trips using their weekday/weekend information helps in identifying the trends of the travel times corresponding to the trips. Week-of-the-year is found to be one of the main factors influencing travel time. Also, most of the links were found to be highly reliable i.e., the trends of the travel times are identified.
机译：行程时间可靠性通常用于指代行程，走廊，方式或路线的运输服务在行程时间方面的一致性水平。通常，驾驶员会根据可靠性与过去的经验进行比较，并帮助他们评估预期的未来旅行时间。随着大多数城市地区交通拥堵程度的提高，至少需要了解交通拥堵发生的时间和地点，从而使驾驶者能够尽可能地估计可能的旅行时间。使用Cronbach系数“α”（一种二维度量）作为性能度量，是对传统指标进行评估以评估链路级可靠性的补充。当前研究使用了北卡罗来纳州梅克伦堡县夏洛特2009年和2010年的INRIX旅行时间数据。确定每个链接的最可靠的旅行时间值，同时也使用本研究中评估的分数将链接级别的性能分类为不同的可靠性级别。这项研究的结果表明，使用工作日/周末信息对旅行进行分类有助于确定与旅行相对应的旅行时间趋势。发现一年中的一周是影响旅行时间的主要因素之一。另外，发现大多数链接是高度可靠的，即，确定了旅行时间的趋势。

著录项

  • 作者

    Puvvala, Ravi Kiran.;

  • 作者单位

    The University of North Carolina at Charlotte.;

  • 授予单位 The University of North Carolina at Charlotte.;
  • 学科 Engineering Civil.;Transportation.
  • 学位 M.S.
  • 年度 2014
  • 页码 52 p.
  • 总页数 52
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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