Traffic sign “Country border. Crossing is prohibited”, placed near the country border at the side of roads crossing the border and closed for traffic.
Appearance of the sign based on reference drawing in Instrukcja o znakach i sygnałach na drogach (English translation: Instruction about traffic signs and signals), made by Ministry of Communication and released in Warsaw in 1975 by Wydawnictwa Komunikacji i Łączności. This version was in use until the end of 1989.
Own work
Miko101