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Prohibition sign for use of the mountain trail with unsuitable footwear on Schilthorn Mountain, Muerren, Bernese Oberland, Switzerland, Europe
Traffic sign, warning of sheep, Reykjanes, Iceland
Skull and crossbones
Traffic sign calling attention fo crossing cross-country skiers, Oslo, Norway, Europe
Disrupted Travel20th October 1938: A rail worker fixing a fog warning notice at South Woodford Railway Station in Essex. (Photo by H. F. Davis/Topical Press Agency/Getty Images)
Hippopotamus and crocodile warning sign, St Lucia Estuary, KwaZulu-Natal Province, South Africa