Intriguingly Simple and Fast Transit Routing

  • Julian Dibbelt
  • Thomas Pajor
  • Ben Strasser
  • Dorothea Wagner
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7933)

Abstract

This paper studies the problem of computing optimal journeys in dynamic public transit networks. We introduce a novel algorithmic framework, called Connection Scan Algorithm (CSA), to compute journeys. It organizes data as a single array of connections, which it scans once per query. Despite its simplicity, our algorithm is very versatile. We use it to solve earliest arrival and multi-criteria profile queries. Moreover, we extend it to handle the minimum expected arrival time (MEAT) problem, which incorporates stochastic delays on the vehicles and asks for a set of (alternative) journeys that in its entirety minimizes the user’s expected arrival time at the destination. Our experiments on the dense metropolitan network of London show that CSA computes MEAT queries, our most complex scenario, in 272 ms on average.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Julian Dibbelt
    • 1
  • Thomas Pajor
    • 1
  • Ben Strasser
    • 1
  • Dorothea Wagner
    • 1
  1. 1.Karlsruhe Institute of Technology (KIT)KarlsruheGermany

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