The barrier type is fence. The real question is what is the fence type, and is it supposed to allow pedestrian’s through, in which case should it have foot=yes.
So, it should then tagged ; barrier=fence + fence_type=hoop_guards … isn’t it ?
Maybe someone could add hoop_guards at fence_type then ?
But, on second thought, there is also barrier=bollard, and it states ;
So, it could then also maybe with ; barrier=hoop_guard(s) in a row … ?
I mapped a while ago a row of bollards , but there is not much ‘visible rendered’ it seems …
in that case maybe ‘simpler’ ; barrier=fence + fence_type=bollards and hoop_guards … because, after all, we are free to choose … if there is enough ‘things’ of the same name/tag, the renderers make it ‘to render’ then …
Is there permission to copy your foto onto Wikimedia Commons ?
Then your foto could be added on https://wiki.openstreetmap.org/wiki/Proposed_features/Fence_attributes , with definition/description, and could it be more ‘used’ if there are ‘much of these things’ …
I didn’t see much of this combined type, but it’s worth adding
please add fence_type=hoop_guard too. I used it on this node. I know there are more of this kind of fence to be added. on this node actually there are two hoop_guards tightly close together and to the walls on both side of street. Still someone may jump over them.
So, according to your reasoning, is a row of bollards / guard_rail / hedge / cable_barrier / etc. then also a fence ? If so, then all these things should be valued as 'fence_type , and not as (linear)barrier …