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Off-Line and On-Line Calibration of Dynamic Traffic Assignment Systems
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Traffic and Logistics.
2009 (English)In: IFAC Proceedings Volumes, 2009, 104-111 p.Conference paper (Refereed)
Abstract [en]

Dynamic traffic assignment (DTA) systems integrate complex transportation demand and network supply simulation models to estimate current traffic conditions, predictfuture network performance and generate consistent, anticipatory route guidance. Before they are applied, DTA system parameters and inputs must be calibrated to accurately reect travel behavior and traffic dynamics. This paper presents a systematic approach that unifies the offline and on-line calibration of DTA systems through a common framework.Off-line calibration simultaneously estimates demand and supply model parameters. The on-line calibration jointly updates in real-time the demand and supply parameter values estimated during the of-line step to better reect prevailing conditions. The methods are general and can utilize any available traffic surveillance information (including emerging data sources, such as Automated Vehicle Identification systems or probe vehicles). The two components complement each other so that the calibration of the DTAsystem parameters efficiently utilizes both historical as well as real-time information. Thecalibration approaches are demonstrated with DynaMIT (Dynamic network assignmentfor the Management of Information to Travelers), using time-varying count, speed and density data obtained from standard loop detectors.

Place, publisher, year, edition, pages
2009. 104-111 p.
Keyword [en]
Calibration, Dynamic traffic assignment, Off-line, On-line
National Category
Transport Systems and Logistics
URN: urn:nbn:se:kth:diva-88174DOI: 10.3182/20090902-3-US-2007.0056ScopusID: 2-s2.0-79960950241OAI: diva2:502163
12th IFAC Symposium on Control in Transportation Systems (CTS’09)
TSC import 2003 2012-02-14. QC 20120216Available from: 2012-02-14 Created: 2012-02-14 Last updated: 2012-02-16Bibliographically approved

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Koutsopoulos, Haris
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