Thanks for the info! It is marked with 'private driveway' and is gated on the west side, presumably belonging to 5808. I may have been too hasty with my edit - it actually does appear to be connected through on closer inspection. When marked as a driveway with destination access, how does OSM know who it belongs to? It would be important for example that traffic isn't routed through that link to 5900 from 231st Ave NE, even though the two driveways from either side would share a node on 232nd Ave NE.