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Public-images-osm logo.svg tiger:FUNCSTAT
tag of unknown meaning and unclear purpose added by imports from official US sources Show/edit corresponding data item.
Group: import
Used on these elements
should not be used on nodesshould not be used on waysshould not be used on areasshould not be used on relations (except multipolygon relations)
Status: in use

Meaning of that tag is unclear[1] and it is dubious whatever it should be present on any object.

In it is defined as "Current functional status" and restricted to be string of length 1.

In OSM database values tiger:FUNCSTAT=A and tiger:FUNCSTAT=S clearly dominate[2].

See for discussion of it meaning.