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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 15.3% over 200 m (Terrain 50), gain 88.0 m over 922 m way. EXTENDED by graph walk: +0 segment(s) at base, +5 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."
 },
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  "county": "County Durham"
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}