There is a proposed tag man_made=adit that is a good idea. But I think that it would be better to use man_made=adit_entrance for adit entrances - too make it clear and obvious what should be tagged and to make it closer to natural=cave_entrance
related: http://wiki.openstreetmap.org/wiki/Tag:man_made%3Dadit and https://github.com/gravitystorm/openstreetmap-carto/pull/704
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