There's also the Vienna Convention on Road Signs and Signals[1] used in quite a few countries. [1] https://unece.org/DAM/trans/conventn/Conv_road_signs_2006v_E

There's also the Vienna Convention on Road Signs and Signals[1] used in quite a few countries. [1] https://unece.org/DAM/trans/conventn/Conv_road_signs_2006v_EN.pdf https://unece.org/DAM/trans/conventn/Conv_road_signs_2006v_E...