3 ms·
TL;DR: > March 1931, when the League of Nations, attempting to manage the sudden explosion in road traffic, convened a Convention Concerning the Unification of
by btbuildem 3y ago
TL;DR:
> March 1931, when the League of Nations, attempting to manage the sudden explosion in road traffic, convened a Convention Concerning the Unification of Road Signs in Geneva
It comes from traffic signs in the first half of the 20th century.