rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Investigating the effect of freeway congestion thresholds on decision-making inputs
  name:
    name part: Qu, Tongbin.
    role:
      role term: creator
  name:
    name part: Lomax, Timothy J.
    role:
      role term: thesis advisor.
  name:
    name part: Dumbaugh, Eric
    role:
      role term: thesis advisor.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2011
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: Congestion threshold is embedded in the congestion definition. Two basic approaches exist in current practice for setting the congestion threshold. One common approach uses the "free-flow" or unimpeded conditions as the congestion threshold. Another approach uses target or "acceptable" conditions. The limited research that has been conducted on the congestion threshold issue focuses on operational problems or policy debates, but relatively little investigation of the effect on decision-making for transportation investment and resource allocation. This research investigated the differences inherent in the threshold choices using detailed freeway data from seven metropolitan areas. Congestion performance measures of delay per mile, Travel Time Index and Planning Time Index were evaluated. This research specifically examined: 1) the ranking values of congestion measure for different congestion thresholds under a variety of real-world travel time distributions, 2) the relationship between change of congestion threshold and change of performance measure, and 3) the appropriateness of using speed limit as a congestion threshold choice by evaluating the peak and off-peak average speed changes in relation to a speed limit change in Houston, Texas. The rankings of congestion measures for freeway segments hold steady across the congestion thresholds ranging from 60 mph to 30 mph and across the congestion measures. From an investment point of view, the congestion threshold speed used is not a concern for funding allocation. The relationship between the delay values for an alternative threshold and the 60 mph threshold has a quadratic form. As the alternative threshold decreases further away from 60 mph, the increment is larger. The more congested a section is, the less the threshold affects measured congestion. For very congested sections, most of the delay is associated with speeds below 30 mph. The posted speed limit affects travel time distribution in the free flow driving …
  note: by Tongbin Qu.
  note: "Major Subject: Urban and Regional Sciences"
  note: Title from author supplied metadata (automated record created 2011-11-01 09:04:20).
  note: Electronic resource.
  note: Doctor of Philosophy Texas A&M University 2010 http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8191
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Urban and Regional Sciences
  subject:
    topic: Congestion threshold
  subject:
    topic: Performance measures
  subject:
    topic: Congestion
  subject:
    topic: Congestion measures
  identifier: http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8191
  record info:
    record content source: TXA
    record creation date: 111114
    record change date: 20151202144226.0
    record identifier: in00002732980