Time-Dependent Contraction Hierarchies

Contraction hierarchies are a simple hierarchical routing technique that has proved extremely efficient for static road networks. We explain how to generalize them to networks with time-dependent edge weights. This is the first hierarchical speedup technique for time-dependent routing that allows bidirectional query algorithms. For large realistic networks with considerable time-dependence (Germany, weekdays) our method outperforms previous techniques with respect to query time using comparable or lower preprocessing time.

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