http://sk53-osm.blogspot.com/2014/05/editing-historical-road-layouts.html
These aren't expressed terribly well as I wanted to push these out quickly before the Zurich hack weekend got up and running. I thought quite a lot about this back in 2011 when I was fiddling with the first OSH data for Berlin, but I never wrote everything down, so I've been trying to recall the key points. Hope that it at least provokes discussion. Jerry
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