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  "road_source": "OpenStreetMap (local PBF extract)",
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  "osm_pbf_path": "data/cache/pbf/england-2026-08-12.osm.pbf",
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  "elevation_provider": "Environment Agency",
  "elevation_dataset": "EA LIDAR Composite DTM 1m (2022)",
  "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Environment Agency",
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  "notes": "Coarse pass: max 7.3% over 200 m (Terrain 50), gain 28.1 m over 585 m way. EXTENDED by graph walk: +5 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): quay-road ADOPTED (England launch slice 2026-08-16): clean-steep."
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 "area": {
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  "county": "Cornwall"
 }
}