[marcodena]

Nice, could you try it with an irregular city? Like Rome?

thx

[p8donald]

Data taken from https://mapzen.com/data/metro-extracts/metro/rome_italy/

Generated file (cropped) https://gist.github.com/pdonald/dfeee5213c8c5379f7b421f9ad5f...

[marcodena]

here you have the problem. You see? They are not correctly detected http://imgur.com/iGLT5Ea

[p8donald]

Yes, to detect them I would also have to include pedestrian paths, service roads and other smaller roads. The solution is not perfect but good enough for the most part.