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https://www.openstreetmap.org/changeset/106677846 - I reduced the (sort of) walkable to a path, and didn't map the right-of-way that has never been cleared.  The numbers you see on the plat are a 40 foot wide right-of-way, with two curves based on circles whose centerline radius (CLR) are both 99.96 feet.  The undeveloped subdivision is called Greenbriar and was platted in November 1963.