Could we changed the scope of this tag, so that it can apply to other objects, and not only to clocks ?
For example, it could apply as well to 'advertising' objects, but it likely could apply to more cases
And in that case we could rather write something like :
visibility=* is used in connection with publicly visible devices or features to display their visibility/readability.
-visibility=house Entity (or device or feature) is readable from up to 5m (targeted mostly for pedestrians, or bikers)
-visibility=street Entity (or device or feature) is readable from up to 20m (targeted for passers-by in for vehicles going slowly)
-visibility=area Entity (or device or feature) is readable from more than 20m (targeted for passers-by in vehicles going fast)
Visibility for non-urban objects
The visibility should be extended to non-urban objects, e.g. the visibility of tracks or paths in the forest. This property is required for IOF orientation maps, see http://wiki.openstreetmap.org/wiki/IOF_mapping#Proposed_features_.28keys.29_for_IOF-Codes.
In practice, in addition to the original values of house, street, area, there are already generally usable values, including:
--sperlingskauz 16:08, 23 July 2017 (UTC)