Hi, thanks for your question!
We, the MKSZ (Hungarian Cyclist Federation) signposted more than 800 km in the region. https://bringasport.hu/projektek/balatonbike365/

I'm just started preparing OSM to be able weighted routing on that network. The bb365:preferred yes tag will be used on routing purpose in our website:
balatonbike365.hu, and our app BB365 https://apps.apple.com/hu/app/bb365/id1572449336 https://play.google.com/store/apps/details?id=com.mksz.bb365