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Is there a (current) best practice to simplify ways? I have found:

https://github.com/podolsir/osmosis-simplifyways

But besides not being alive, here (http://permalink.gmane.org/gmane.comp.gis.openstreetmap.devel/26854) it says:

Ok, I found out that osmosis-simplifyways is not compatible with osmosis 0.43.1. It will work with 0.39. But the tool is buggy. It removes nodes from ways where it connects to other ways.

Since I want to use the data for routing I guess it wouldn't work anyway.

Is there some well tested Ramer–Douglas–Peucker implementation to simplify osm data properly?

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You can find some hints in the open source code of the JOSM editor, that program has a way-simplify-feature inside.

Or have a look at that JOSM plugin named RemoveRedundantPoints

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It requires ArcGIS, but see my detailed response here in another GIS StackExchange thread regarding building networks and simplifying data while maintaining the topological structure:

Building Large Network Datasets from OpenStreetMap in ArcGIS?

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  • Guess I will write something myself. Still, thanks, guys. – user54586 Aug 21 '15 at 15:13

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