In the harbor of the town I visited in Hiroshima about 100 years ago, there were these completely safe-looking docks. Clearly discarded Styrofoam and bits of unused wood tied together with rope of questionable strength and composition are a top-notch system for dock construction, but JUST to be super safe, they decided to post a small sign that said "危険" (kiken) or "dangerous". Not that such a over-protective bit of visual warning is really necessary for such a clearly sturdy piece of nautical boat-boarding equipment.
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