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Congestion indicators from the users’ perspective: alternative formulations with stochastic reference level
KTH, School of Architecture and the Built Environment (ABE), Transport and Economics (closed 20110301), Traffic and Logistics (closed 20110301).
KTH, School of Architecture and the Built Environment (ABE), Transport and Economics (closed 20110301), Traffic and Logistics (closed 20110301).
2010 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Congestion causes delays and environmental impacts. Policy makers and transport planners have used congestion indicators for monitoring traffic conditions in urban areas. These indicators require defining a reference level of congestion (based for example on free flow conditions). In most cases reported in the literature this reference point is constant and typically corresponds to speed limits. This paper proposes a methodology for the definition of congestion indicators that takes into consideration the preferences and variability across the individual commuters and hence, develops congestion indicators from the users of the system point of view. An analytical approach is developed pointing out that, as expected, for certain simple distributions of desired speed (i.e. triangular) some indicators are biased. A case study using a microscopic simulation model to study a small, dense, and very congested urban network in Stockholm illustrates the impact of applying this new definition in the calculation of congestion indicators. The results of the case study illustrate the bias of existing methods and identify indicators that are less sensitive to the distribution of the reference speed among drivers.

Place, publisher, year, edition, pages
2010.
National Category
Transport Systems and Logistics
Identifiers
URN: urn:nbn:se:kth:diva-39544OAI: oai:DiVA.org:kth-39544DiVA: diva2:440092
Conference
12th WCTR, July 11-15, 2010, Lisbon
Note
QC 20110912Available from: 2011-09-12 Created: 2011-09-12 Last updated: 2011-09-12Bibliographically approved
In thesis
1. Relevance and Reliability of Area-Wide Congestion Performance Measures in Road Networks
Open this publication in new window or tab >>Relevance and Reliability of Area-Wide Congestion Performance Measures in Road Networks
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

For operational and planning purposes it is important to observe, predict and monitor the traffic performance of congested urban road links and networks. This monitoring effort describes the traffic conditions in road networks using congestion performance measures. The objective of this research is to analyse and evaluate methods for measuring congestion and congestion performance measures for monitoring purposes. For this objective, a selection of the required aspects of the performance measures in the literature is considered. The aspects to be considered can be classified into two categories: A first group relates to the statistical aspects of these indicators, i.e. reliability. The second relates to their ability to capture the impacts of congestion, i.e .relevance. The reliability and relevance of the congestion performance measures are evaluated. A recommendation of the most suitable indicator is provided at the end of the study.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. 52 p.
Series
Trita-TEC-PHD, ISSN 1653-4468 ; 11:002
Keyword
Congestion Performance Measures, Reliability, Relevance, Road networks
National Category
Transport Systems and Logistics
Research subject
SRA - Transport
Identifiers
urn:nbn:se:kth:diva-39551 (URN)
Public defence
2011-09-22, E1, Lindstedtsvägen 3, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note
QC 20110912Available from: 2011-09-12 Created: 2011-09-12 Last updated: 2012-06-12Bibliographically approved

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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