The obvious answer here is for windfall blocking the trail. It is not always possible to go around a windfall, nor would you necessarily want to get into that habit; the new trail you would create only adds to the erosion of a potentially fragile area. It is better instead to simply clear the trail. Read the article "Pack Saws and Camp Axes" for a full explanation of why it is so important to carry a pack saw when you are out on the trail.
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