I found this kind of cycle barrier in Oldenburg right here:
There are 2-3 similar barriers in the same region.
Problem: there is no design specified in openstreetmap fitting for those. How can this be solved?
(I mean the list below “Types / designs of cycle barriers” here: Cycle barrier in OSM Wiki )
I would just map this as
barrier=cycle_barrier
ANDcycle_barrier=single