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  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12-roads.osm.pbf",
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  "elevation_provider": "Environment Agency",
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  "notes": "Coarse pass: max 10.6% over 200 m (Terrain 50), gain 21.2 m over 152 m way. EXTENDED by graph walk: +2 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): discovered-lane-50-2344-4-8180",
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 },
 "area": {
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  "county": "Cornwall"
 }
}