One may want to walk along the street and map info from available opening hour signs. In this situation it may be useful to record that some objects miss opening hours sign.
Such tag would allow to prefer objects with completely unknown opening hours over ones where opening hours are unknown and more complicated to obtain. I started using opening_hours_sign=no for this purpose and created https://wiki.openstreetmap.org/wiki/Proposed_features/opening_hours_sign%3Dno <https://wiki.openstreetmap.org/wiki/Proposed_features/opening_hours_sign%3Dno> Comments are welcomed.
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