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  "road_source": "OpenStreetMap (local PBF extract)",
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  "elevation_provider": "Environment Agency",
  "elevation_dataset": "EA LIDAR Composite DTM 1m (2022)",
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  "notes": "Coarse pass: max 19.9% over 200 m (Terrain 50), gain 111.7 m over 1369 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (England launch slice 2026-08-16): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (51.1009, -3.9948)'.",
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 },
 "area": {
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  "county": "Devon"
 }
}