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  "road_source": "OpenStreetMap (local PBF extract)",
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  "elevation_provider": "Environment Agency",
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  "notes": "Coarse pass: max 15.6% over 200 m (Terrain 50), gain 51.3 m over 479 m way. EXTENDED by graph walk: +1 segment(s) at base, +5 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 3 overlapping proposal(s): discovered-lane-51-1954-3-5899, discovered-lane-51-2021-3-5896, discovered-lane-51-2041-3-5807"
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 "area": {
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}