Sometimes in areas with sandy/muddy ground, multiple parallel trails will start to form.
What is the least impactful way to walk a trail like this? Do you stay on whichever trail shows the most recent travel of the deepest or another option?
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In this specific instance I would follow the deepest (most damaged) trail because it is unlikely to regrow. That gives the other trails a chance to recover.
If the choice is between multiple very lightly traveled trails, I'd advise to take the one showing least damage (or even creating a new one) - again thinking Which one(s) are likely to recover? -> all.
It all depends on the vegetation and environment though, sometimes it's so fragile that not walking there might be best ;-)