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You can hope that all the buildings from the national mapping agency data get imported, and then you calculate buffer zones for every building, and turn those into suitable polygons where the buffers overlap enough :slight_smile: I don’t remember the exact distances for that. That’s the only definitive way I’ve read, on how to define them not-from-street-signs. Even that would give holes, which are not “outside” in reality. Other than that, it’s hard to get it right.

Only recently there has been some coordinated effort to collect these highway=city_limit signs. The only other way to be sure is maxspeed=50 + source:maxspeed=FI:urban, if somebody has bothered to tag it. Maxspeed=50 without the condition “inside populated place” is very rare on major highways. Small rural roads (tertiary and below) can have a 50 limit because of the curves and such, even outside populated places. I’d hope that most, if not all, primary highways have the lower speed limit sections tagged appropriately by now.

It would be hard to draw the populated areas as separate polygons, mostly because often the major highways penetrate deep into the populated area, but are not “inside populated area” themselves.

Other than that, you might get a good guess from “a place=city/town node is near and road is secondary or lower”. My wild guess is that most place=village 's are not “inside a populated area” with regards to the traffic rules - but at least some are (for example “Veikkola”). In the first sentence, “near” being roughly a radius of 2 km.

Let us know if you have a nice overlay with your guesses :slight_smile: