Italian warning road sign: hump.The upper part of the sign bears fasces (the graphical details of the faces are only exemplificative) and the acronym of the Royal Automobile Club of Italy (RACI); the lower part of the sign bears the name of the sponsor. Introduced at the end of 1920s and used unitl the begin of 1930s.
Annuario Automobilistico, 1931 Reale Automobile Club d'Italia
Original:  Reale Automobile Club d'Italia (RACI)

Vectorization:  Earthshaker13