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Robust Routing in Urban Public Transportation: How to Find Reliable Journeys Based on Past Observations Böhmová, Katerina Mihalák, Matús Pröger, Tobias Srámek, Rastislav Widmayer, Peter Algorithms Optimization Robustness Route planning Public transportation We study the problem of robust routing in urban public transportation networks. In order to propose solutions that are robust for typical delays, we assume that we have past observations of real traffic situations available. In particular, we assume that we have "daily records" containing the observed travel times in the whole network for a few past days. We introduce a new concept to express a solution that is feasible in any record of a given public transportation network. We adapt the method of Buhmann et al. [Buhmann et al., ITCS 2013] for optimization under uncertainty, and develop algorithms that allow its application for finding a robust journey from a given source to a given destination. The performance of the algorithms and the quality of the predicted journey are evaluated in a preliminary experimental study. We furthermore introduce a measure of reliability of a given journey, and develop algorithms for its computation. The robust routing concepts presented in this work are suited specially for public transportation networks of large cities that lack clear hierarchical structure and contain services that run with high frequencies. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Katerina Böhmová and Matús Mihalák and Tobias Pröger and Rastislav Srámek and Peter Widmayer 2013 Is Part Of OASIcs, Volume 33, 13th Workshop on Algorithmic Approaches for Transportation Modelling, Optimization, and Systems (2013) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/OASIcs.ATMOS.2013.27 urn:nbn:de:0030-drops-42428 https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.ATMOS.2013.27 eng https://creativecommons.org/licenses/by/3.0/legalcode