Reference : Dynamic OD estimation in congested networks: theoretical findings and implications in...
Scientific journals : Article
Engineering, computing & technology : Multidisciplinary, general & others
Dynamic OD estimation in congested networks: theoretical findings and implications in practice
Frederix, Rodric mailto []
Viti, Francesco mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Tampere, Chris M.J. mailto []
[en] Dynamic Origin-Destination Estimation ; Bi-level Optimization ; Congestion Spillback
[en] In this study we analyse the impact of congestion in dynamic origin–destination
(OD) estimation. This problem is typically expressed using a bi-level formulation.
When solving this problem the relationship between OD flows and link flows is
linearised. In this article the effect of using two types of linear relationship on the
estimation process is analysed. It is shown that one type of linearisation implicitly
assumes separability of the link flows, which can lead to biased results when
dealing with congested networks. Advantages and disadvantages of adopting
non-separable relationships are discussed. Another important source of error
attributable to congestion dynamics is the presence of local minima in the
objective function. It is illustrated that these local minima are the result of an
incorrect interpretation of the information from the detectors. The theoretical
findings are cast into a new methodology, which is successfully tested in a proof
of concept.

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