KIT | KIT-Bibliothek | Impressum | Datenschutz

Integrating ULTRA and trip-based routing

Sauer, Jonas; Wagner, Dorothea; Zündorf, Tobias

Abstract:
We study a bi-modal journey planning scenario consisting of a public transit network and a transfer graph representing a secondary transportation mode (e.g., walking or cycling). Given a pair of source and target locations, the objective is to find a Pareto set of journeys optimizing arrival time and the number of required transfers. For public transit networks with a restricted, transitively closed transfer graph, one of the fastest known algorithms solving this bi-criteria problem is Trip-Based Routing [Witt, 2015]. However, this algorithm cannot be trivially extended to unrestricted transfer graphs. In this work, we combine Trip-Based Routing with ULTRA [Baum et al., 2019], a preprocessing technique that allows any public transit algorithm that requires transitive transfers to handle an unrestricted transfer graph. Since both ULTRA and Trip-Based Routing precompute transfer shortcuts in a preprocessing phase, a naive combination of the two leads to a three-phase algorithm that performs redundant work and produces superfluous shortcuts. We therefore propose a new, integrated preprocessing phase that combines the advantages of both and reduces the number of computed shortcuts by up to a factor of 9 compared to a naive combination. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000138879
Veröffentlicht am 14.10.2021
Originalveröffentlichung
DOI: 10.4230/OASIcs.ATMOS.2020.4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Informatik (ITI)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2020
Sprache Englisch
Identifikator ISBN: 978-3-9597717-0-2
ISSN: 2190-6807
KITopen-ID: 1000138879
Erschienen in 20th Symposium on Algorithmic Approaches for Transportation Modelling, Optimization, and Systems (ATMOS 2020). Ed.: D. Huisman
Veranstaltung Symposium on Algorithmic Approaches for Transportation Modelling, Optimization, and Systems (ATMOS 2020), Online, 07.09.2020 – 08.09.2020
Verlag Schloss Dagstuhl - Leibniz-Zentrum für Informatik GmbH (LZI)
Seiten Art.-Nr.: 4
Serie OpenAccess Series in Informatics (OASIcs) ; 85
Nachgewiesen in Scopus
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page