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It would be great to have a slightly expanded article describing how "contraction hierarchies" works. I get the basic point, about using a simplified version of the network, but I don't really know what the routing/preprocessing technique actually does... -- mcld ( talk) 21:51, 10 February 2013 (UTC) reply

OK, I have added some blurb, based on a CC-BY licenced tutorial article. I hope this is a helpful start, still, it'd be great to have some expertise on the matter.-- mcld ( talk) 22:56, 10 February 2013 (UTC) reply

I did a complete rework, less technical I hope. -- WhereAreMyPointersAt 21:02, 21 July 2019 (UTC+2)