Warning sign
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See also: Warning road sign.
Warning signs can indicate any potential hazard, obstacle or condition requiring special attention.
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Sign in Niagara Falls, Ontario, warning people not to climb over guard rail overlooking the Niagara River.
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Warning entrance sign to an exhibitions at Palazzo Pitti museum compound, Florence, Italy.
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"Beware of Dog" sign at the Glasgow Necropolis
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Wet floor sign with warnings in both English and Spanish
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Caution wet floor sign
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A sign indicating that no parking is allowed on a lane
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bio hazard
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laser
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Dog-related signs