@BUnicycling According to the wiki:
The tag building=ruins is frequently used to mark abandoned, ruined buildings. However, according to the meaning of building=*, this tag should be used for a building constructed as ruins (for example sham or scenic ruins in an English landscape garden)...
@dtc I wrote up about my procedure of boundary importing: https://www.openstreetmap.org/user/Janjko/diary/407299
But you first need the boundary data with the correct license (being Sweden, you probably have it) and you need to have it in the .osm format. I did that with ogr2osm together with a script, described here: https://wiki.openstreetmap.org/wiki/Croatia/Import_administrative_borders
But consult with the Swedish community first.
@barefootstache I found this official site: https://narodne-novine.nn.hr/clanci/sluzbeni/2019_09_92_1823.html
I'm guessing we need to tag our signs traffic_sign=HR:A01, and when I look at taginfo, there are already signs tagged like that.
OK so I made a video.