Congestion indicators from the users’ perspective: alternative formulations with stochastic reference level
2010 (English)Conference paper (Refereed)
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
Transport Systems and Logistics
IdentifiersURN: urn:nbn:se:kth:diva-39544OAI: oai:DiVA.org:kth-39544DiVA: diva2:440092
12th WCTR, July 11-15, 2010, Lisbon
QC 201109122011-09-122011-09-122011-09-12Bibliographically approved