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Superstition? Or what caused this?
(sh.itjust.works)
Desire paths Desire paths can be paths created as a consequence of erosion caused by human or animal foot-fall or traffic. The paths usually represent the shortest or most easily navigated routes between origins and destinations. https://en.wikipedia.org/wiki/Desire_path
Avoiding people coming from the other direction maybe?
Hm maybe, but it seems like the path under would be wide enough, no?
Not riding a bike, though.