It seems I misrepresented the manhole cover inscription - the proper wording (as I observed this morning) is Confined Space Danger Permit Required. But I am still puzzled. Isn't the hazard not that it is a confined space, but that it is the opposite - an open space allowing one to plummet pell mell to the depths of the earth? OK, I'll stop thinking about this now.
(Image: flickr.)
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