Travel - Why does Andorra use the European Union flag at its border?

Today I drove from France into Andorra. The first sign for Andorra I saw was a EU flag with "Andorra" written across the centre, just like the EU cou

Today I drove from France into Andorra. The first sign for Andorra I saw was a EU flag with "Andorra" written across the centre, just like the EU countries use at their borders. Is there a valid/legal reason? Or some other explanation?

or:Today I drove from France into Andorra. The first sign for Andorra I saw was a EU flag with \"Andorra\" written across the centre, just like the EU countries use at their borders. Is there a valid/legal reason? Or some other explanation?

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