You can read more about contraction hierarchies on GraphHopper Wiki
<https://github.com/graphhopper/graphhopper/blob/master/docs/core/ch.md>.
Essentially it's a post-import process during graph building that makes
routing faster, but plays with only one vehicle.
And right now I think we cannot check a graph what features has enabled.
Only by opening and catching exceptions we can determine if CH is on or off.
I have opened an issue
<https://github.com/graphhopper/graphhopper/issues/285> for that.
Maybe Peter can help more here, but the default settings for graph
creation is with them enabled.
You need to study and change the config.properties file for disabling them.
--
Emux
Cruiser <http://wiki.openstreetmap.org/wiki/Cruiser> - Atlas
<http://wiki.openstreetmap.org/wiki/Atlas_%28navigation_application%29>
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