I’ve noticed this in pictures from accross asia, including india, singapore, and myannmar. This doesn’t exist in European or American road signage systems.
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In Indonesia, they are painted black and white stripes like that to increase visibility. Heck, Jakarta used to paint them using colorful palette a while back, but recently went back to black and white. I personally prefer them to use colorful paints instead of just black and white, especially in urban areas where everything is grey already.