What are the yellow stickers with the letter G and one or two arrows on some Japanese streets?

What are the yellow stickers with the letter G and one or two arrows on some Japanese streets? - Numbers Wall Decor

I've been traveling around Japan recently and I've come across these stickers with the letter "G" and one or two arrows in many streets in Tokyo, Osaka and Kyoto.

Some streets have dozens of them. What do they mean?






Pictures about "What are the yellow stickers with the letter G and one or two arrows on some Japanese streets?"

What are the yellow stickers with the letter G and one or two arrows on some Japanese streets? - Yellow Pikachu Plushmascot
What are the yellow stickers with the letter G and one or two arrows on some Japanese streets? - Door of old building with graffiti on walls
What are the yellow stickers with the letter G and one or two arrows on some Japanese streets? - Sticker with text have a nice day





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Images: Magda Ehlers, mentatdgt, Ryutaro Tsukata, Ketut Subiyanto