I can't remember why I added this specific tag on node 

https://www.openstreetmap.org/node/12008703519

I do know I've thought several times there needs to be a way to tag the fact guideposts are specifically for "Public Rights of Way" or PRoW.

But, with that said I do not remember doing this, and the tag isn't very helpful. I've deleted it in changeset

https://www.openstreetmap.org/changeset/153246711

Thanks for letting me know.