Updating trip matrices for Copenhagen using multiple data sources
Traffic planning in the Greater Copenhagen Region (have over the last 10 years mainly been supported by the so-called OTM traffic model. The behavioural models in OTM include advanced state-of-the-art utility-based formulations, which are combined with base-matrices in a pivot-correction procedure. Before and after studies of specific projects have shown, that these matrices might be the Achilles heal of the whole model system. Vuk and Hansen (2006) therefore validated the present version of the OTM traffic model (version 4.0 from summer 2000) and concluded that a major drawback of the model was indeed outdated base 1992 matrices. From January 2005 to March 2007 the OTM model has therefore been in a large-scale process of updating where creation of new trip matrices has been the main focus.
The article describes the undertaken methodology for constructing the travel matrices for Copenhagen, and how the improved matrices influence the performance of the model. A main focus in the work has been to utilise various data sources for estimation of the new matrices. This includes telephone survey data, cordon line surveys and existing transport surveys to construct the base matrices, traffic counts to adjust these, and digital network databases. The article also demonstrates a new approach to adjust public transport matrices to counts.