How did traffic signs became to have same exact meanings worlwide?

I would like to know how diff. world govs. got together to use same traffic signs with the same meanings worlwide? Eventhough some traffic laws are diff.. Example: making a right turn when light is red cant' not be done in every state or country.

Answers:
The basic signs are stop curves but they are in other langues an was done so so every body could drive in othere contrys


another proof of intelligent design or evolution - take your pick.

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