Document Server@UHasselt >
Research >
Research publications >

Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/11744

Title: Calibrating Activity-Based Models with External Origin-Destination Information Overview of Possibilities
Authors: COOLS, Mario
WETS, Geert
Issue Date: 2010
Citation: TRANSPORTATION RESEARCH RECORD, (2175). p. 98-110
Abstract: Many practitioners question the advantages of activity-based models over conventional four-step models in regard to replication of traffic counts. This paper highlights a framework that actively links travel demand models in general and activity-based models in particular with traffic counts. Two approaches are presented that calibrate activity-based models with traffic count-an indirect and a direct approach. The indirect approach tries to incorporate findings based on the analysis of traffic counts into the components of the activity-based models. The direct approach calibrates the parameters of the travel demand model in such a way that the model replicates the observed traffic counts (quasi-) perfectly. A practical example is provided to illustrate the direct approach. The study area for this practical example is Hasselt, Belgium, a city of about 70,000 residents, and its surrounding municipalities. The practical examples revealed not a single roadway to success in calibrating activity-based models, but different options exist in fine-tuning the activity-based model. It is important to recognize some open issues and avenues for further research. First, it is not always appropriate to assume that traffic counts are completely correct. Setting up some belief structure might increase the responsiveness of the activity. based model. In addition, the origin-destination matrix calibration that optimizes the correspondence between estimated and observed screen-line counts could negatively affect the correspondence to other measures, such as vehicle miles traveled. To conclude, the formulation of a multiobjective calibration method is a key challenge for further research.
Notes: Wets, G (reprint author) [Cools, Mario; Moons, Elke; Wets, Geert] Hasselt Univ, Transportat Res Inst, BE-3590 Diepenbeek, Belgium. geert.wets@uhasselt.be
URI: http://hdl.handle.net/1942/11744
DOI: 10.3141/2175-12
ISI #: 000286448700012
ISSN: 0361-1981
Category: A1
Type: Journal Contribution
Validation: ecoom, 2012
Appears in Collections: Research publications

Files in This Item:

Description SizeFormat
Published version531.37 kBAdobe PDF

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.