Well, I guess it isn't as simple as I thought it would be. The answer is that whoever wrote "big safe" screwed up and meant to write "dig safe". So the sign just meant that it was safe to dig in this spot, and that construction workers in Rhode Island don't know how to spell.
I'll let someone else give it a go and see if they can actually ask us an easy question.
P.S. Maybe someone should ask a math question --- you know, based on all the counting.
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