NDLI: Engineering highway hierarchies

Content Provider	ACM Digital Library
Author	Sanders, Peter Schultes, Dominik
Copyright Year	2012
Abstract	Highway hierarchies exploit hierarchical properties inherent in real-world road networks to allow fast and exact point-to-point shortest-path queries. A fast preprocessing routine iteratively performs two steps: First, it removes edges that only appear on shortest paths $\textit{close}$ to source or target; second, it identifies low-degree nodes and bypasses them by introducing shortcut edges. The resulting hierarchy of highway networks is then used in a Dijkstra-like bidirectional query algorithm to considerably reduce the search space size without losing exactness. The crucial fact is that ‘far away’ from source and target it is sufficient to consider only high-level edges. Experiments with road networks for a continent show that using a preprocessing time of around 15 min, one can achieve a query time of around 1ms on a 2.0GHz AMD Opteron. Highway hierarchies can be combined with goal-directed search, they can be extended to answer many-to-many queries, and they can be used as a basis for other speed-up techniques (e.g., for transit-node routing and highway-node routing).
Starting Page	1.1
Ending Page	1.40
Page Count	40
File Format	PDF
ISSN	10846654
e-ISSN	10846654
DOI	10.1145/2133803.2330080
Journal	Journal of Experimental Algorithmics (JEA)
Volume Number	17
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2012-09-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Algorithm engineering Road network Route planning Speed-up technique
Content Type	Text
Resource Type	Article
Subject	Theoretical Computer Science

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