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undesirable gravel
(lemmy.nz)
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
it's the gravel. You can see that it's "smooth and even" where the desire path joins the designated path. On foot it doesn't matter but on bike that short section—who knows why it's there—is unbearable.
Oooh you’re right!! I can see where the concrete starts now that you mentioned it. That’s so interesting!