{ "feature": "stop_density", "metadata": { "id": "stop_density", "label": "Public transport access-site density near roads", "family": "Traffic and activity", "source": "f2-source", "numerator": [], "denominator": [], "definition": "Count of eligible unique physical sites in the LSOA within100m of eligible roads / eligible road km in the LSOA.", "unit": "sites per eligible road km", "role": "candidate", "note": "Retrospective physical access-site density, not service frequency, ridership or pedestrian flow. F6 source and national band gates passed; 26 LSOAs remain unavailable. F7 tests a 2026 snapshot against earlier collisions, not an as-of-2022 forecast.", "status": "provisional", "zeroBand": false, "comparability": "See source audit and F6 gate decisions; fixed common definition with explicit limitations.", "observationPeriod": "NaPTAN 13 October 2026; eligible OS roads April 2026", "direction": "Higher band means higher feature value; collision-risk direction is untested.", "geographicResolution": "LSOA2021, England and Wales", "licence": "Expected public-data licence; exact extract terms not yet verified", "sourceStatus": "Acquired and checked", "sourceUrl": "https://naptan.api.dft.gov.uk/v1/access-nodes?dataFormat=csv", "releasedAt": null, "validCount": 35646, "missingCount": 26, "bandScheme": "Combined E&W deciles", "sourceVersion": "ew-f6-v1", "phase": "F2", "mileageAllocationUse": "No direct use identified in current pilot; nationwide allocation audit pending", "bandedCount": 35646, "bandsWithheld": false, "releaseDecision": "banded", "denominatorDefinition": "Non-fictitious OS road functions Motorway,A Road,B Road,Minor Road,Local Road,Local Access Road. Public-use proxy: function classes do not certify legal access. Restricted Local Access Road and Secondary Access Road excluded.", "qualityFlags": [ "banded", "not_collision_tested_in_F7", "not_claims_validated", "retrospective_source_vintage" ], "featureFreezeVersion": "ew-f6-v1", "frozenBandsAvailableFrom": "2026-10-13T08:44:00.646694+00:00", "historicalAsOf2022Eligible": false, "claimsValidation": false, "predictiveValidation": false, "sourceRegisterUrl": "/research/ew-deciles/f6-v1/f2-audit.json", "readiness": "Ready for F7 collision screening; not yet tested", "historicalForecastEligibility": "This source edition and band definition were frozen in October 2026. Historical forecast-origin availability is not established.", "measurementType": "Derived source measure" }, "tested": true, "screeningFamily": "F7 eleven-candidate family", "nationalLSOAs": 35672, "nationalNumericLSOAs": 35646, "nationalBandedLSOAs": 35646, "metrics": [ { "feature": "stop_density", "form": "linear", "scenario": "fitted", "sample": "temporal_2023", "rows": 33085, "lsoas": 33085, "zeroRows": 7584, "observed": 92618, "expected": 97325.18239494954, "baseExpected": 97445.23063957848, "oe": 0.9516344867883463, "baseDeviance": 70863.60638521746, "featureDeviance": 68218.78077767513, "gain": 0.037322763297777284, "lower95": 0.030465890671503466, "upper95": 0.04388609707161518, "blocks": 162, "unsupportedRows": 0, "conditionalFixedPredictions": true }, { "feature": "stop_density", "form": "linear", "scenario": "fitted", "sample": "region_East Midlands", "rows": 5686, "lsoas": 2843, "zeroRows": 1328, "observed": 15400, "expected": 17416.47213547975, "baseExpected": 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density near roads", "family": "Traffic and activity", "source": "f2-source", "numerator": [], "denominator": [], "definition": "Count of eligible unique physical sites in the LSOA within100m of eligible roads / eligible road km in the LSOA.", "unit": "sites per eligible road km", "role": "candidate", "note": "Retrospective spatial context; no2022 as-of eligibility. 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