In Germany, a city may not put give-way signs in a tempo 30 area, unless they are given permission. Every time they want to do this, the city will need an exception and request one. Takes time, costs money.
So some cities just put lowered kerbs directly onto residential roads, because then, the vehicles going over the lowered kerb, automatically have to give way. No sign needed
Mapillary view, coming from the east:
Bing view with data of the same crossing
As you can see, this is effectively the same as giving the cars coming from the right side a give-way sign. In the Mapillary picture, there still is one (cut off, but nevertheless), but it has since been removed, because it was disputed and instead, they built the lowered kerb. Clearer now? These constructs are quite common here in low speed zones, because they also reduce the amount of signs needed which is a welcomed benefit.
So you can find them on residential streets, maybe also unclassified. Certainly not higher ones, but who knows…