Traffic sign that warns from dangerous or invisible bends. Version from 1938, based on reference drawing #2 from Instrukcja nr K2 o znakach drogowych i urządzeniach ostrzegawczo-zabezpieczających na drogach publicznych (English translation: Instruction No. K2 about road signs and warning-securing devices on public roads) published in Warsaw in 1938 by Ministry of Communication.
Own work
Miko101