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You can compare the maps here, but that of course ignores a huge amount of "hidden" data:


Then there was a small analysis in Germany in 2012, but obviously a lot has changed since then.

http://www.mdpi.com/1999-5903/4/1/1 (Or just have a look at the images on the German article: http://neis-one.org/2012/01/osm-germany-2007-2011/)

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