https://www.openstreetmap.org/way/61599495
https://www.openstreetmap.org/way/605940379
has no officially german-listed traffic_sign BUT:
has an official metal sign from the local forestry department + the german traffic_sign=DE:101

https://wiki.openstreetmap.org/wiki/File:Zeichen_101_-_Gefahrstelle,_StVO_1970.svg