Mysterious directional stickers in Berlin

Yesterday while biking around Prenzlauer Berg and heading toward Wedding, I came across another rash of mysterious directional stickers on sign poles along Eberswalderstraße.

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This was after finding directional stickers last spring further south along Stresemannstraße and turning onto Zimmerstraße. The stickers are typically orange (or faded orange) with an arrow or arrows pointing straight ahead or turning left or right.

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A couple of times, there would be a blue triangle nearby pointing in the same direction, as if the streets are telling us something.

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I also found two orange arrows last year by Marianneplatz on Bethaniendamm. On all three occasions, I photographed the directional stickers using my Canon SX 280 HS camera with built-in GPS unit, so you can see pictures and their locations on this Flickr map.

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This morning, I looked at the photos I took yesterday. I didn’t see it at the time, but that blue triangle appears again on a few sign poles, too.

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Weird! Three separate locations in the city, but what’s in common?