The direct source is the cadastral street layer. Unfortunately, iD truncates the long URL, but it is available as WMS at https://lvmgeoserver.lvm.lv/geoserver/ows?FORMAT=image/jpeg&VERSION=1.3.0&SERVICE=WMS&REQUEST=GetMap&LAYERS=public:Orto_LKS,publicwfs:Kadastra_karte,publicwfs:arisstreet,publicwfs:arisroad,publicwfs:arisbuilding&STYLES=&CRS={proj}&WIDTH={width}&HEIGHT={height}&BBOX={bbox} Broadly speaking, it's the street layout defined by the municipality at some point and documented by VZD. By the time it gets into VZD database, it's basically been reviewed and approved by the municipality. But it still may or may not properly appear as land use in municipality planning docs (because it's all a pretty big mess). In this case, it does though. Here is the actual land registry entry https://www.kadastrs.lv/properties/2200103753 . There's no way to copy a direct URL to terplāns map, but you can zoom into this place at https://geolatvija.lv/geo/tapis and see the land use specified as road, i.e. "Transporta infrastruktūras teritorija". In this case, the terplāns is in an approved state. As for OSM, I normally tag these as `proposed` (without researching details for each and every of hundreds of example streets like this). This doesn't imply there is some official construction "proposal" here. It might take a month or 30 years before something is built or it might get rezoned completely. But it helps to have it traced from official lines (especially if land borders are well-defined like here) for the cases where roads do get built. Plus, there are street addresses here using the street name so that alone is usually enough to justify tracing a rough planned road outline. Any properties built here would be expected to have driveways facing the street they belong to. Anyway, I digress.