Airport Red and Green Taxiways Meaning

Does anyone know what those red or green markings in the airports mean?

It’s visibility

Green = Clear Skies, Good Visibility
Red = Fog, Bad Visibility

Unless you mean on the runways, then Green is the runway favored because of the winds

It’s sand/dirt surface

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Is green sand and red is dirt?

Pardon, didn’t notice that you also had green there
Green - grass
Red - dirt/sand

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Ok this makes me understand the taxiways better. Thank you!