Road signs in Japan
In 1950, a complete revision of the "Road Signs Ordinance" was promulgated and enforced as an Ordinance of the Prime Minister's Office and the Ministry of Construction. Unlike the 1922 and the 1940s devised road signs, it included both bilingual Japanese and English text and symbols. Warning signs were changed from a European red-bordered triangular design to an American MUTCD yellow diamond design. This road signage system was used until 1963, when it was replaced with a new road signage system that is based on the Vienna Convention on Road Signs and Signals. The present-day Japanese road signage system also replaced the stop sign's shape with an inverted equilateral triangle like the stop sign used in West Germany from the 1945 to 1971.