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"reconstructedMiles": 23184409204.619995, "relativeError": 3.970178221181996e-07 }, { "year": 2025, "regionId": "E12000008", "road": "motorway", "publishedMiles": 14521500000.0, "reconstructedMiles": 14521537192.794067, "relativeError": 2.561222605611184e-06 }, { "year": 2025, "regionId": "E12000009", "road": "a", "publishedMiles": 15727900000.0, "reconstructedMiles": 15727935172.654207, "relativeError": 2.236322344828592e-06 }, { "year": 2025, "regionId": "E12000009", "road": "motorway", "publishedMiles": 6299100000.0, "reconstructedMiles": 6299063278.578105, "relativeError": 5.829629930470569e-06 }, { "year": 2025, "regionId": "S92000003", "road": "a", "publishedMiles": 14455600000.0, "reconstructedMiles": 14455558527.57399, "relativeError": 2.868952240663261e-06 }, { "year": 2025, "regionId": "S92000003", "road": "motorway", "publishedMiles": 5516400000.0, "reconstructedMiles": 5516402065.686387, "relativeError": 3.744627632263927e-07 }, { "year": 2025, "regionId": "W92000004", "road": "a", "publishedMiles": 9918200000.0, "reconstructedMiles": 9918123065.671488, "relativeError": 7.756884163678063e-06 }, { "year": 2025, "regionId": "W92000004", "road": "motorway", "publishedMiles": 2473900000.0, "reconstructedMiles": 2473865800.5994987, "relativeError": 1.3824083633635645e-05 } ], "regionalReconciliationByYear": [ { "year": 2021, "rows": 22, "maxRelativeError": 0.008332747894559324 }, { "year": 2022, "rows": 22, "maxRelativeError": 0.0122401674352812 }, { "year": 2023, "rows": 22, "maxRelativeError": 0.006814519214432802 }, { "year": 2024, "rows": 22, "maxRelativeError": 0.007050888176453869 }, { "year": 2025, "rows": 22, "maxRelativeError": 1.5870890474571368e-05 } ], "conclusion": { "majorRoadLSOAPanel": "blocked", "reason": "Every supplied MRDB feature is a two-point schematic endpoint chord. Clipping chords into LSOAs or frost cells does not establish the actual road path. The geometry-to-traffic join is auditable, but a valid spatial denominator and collision-to-link match still require centreline geometry and validation.", "linkJoin": "Use exactly one AADF row per (year,count_point_id), match MRDB CP_Number within the same year, and preserve estimation_method and estimation_method_detailed. AADF has both directions combined; never multiply by two.", "mileage": "all_motor_vehicles \u00d7 link_length_km / 1.609344 \u00d7 calendar days; the kilometre field avoids extra rounding in link_length_miles. For LSOA allocation, a verified actual road-centreline path must first be established, and any rescaling to represented length documented.", "historicLengthGate": "Independently reconstructed regional totals differ from published historical mileage. Matching current AADF metadata to an annual network file alone does not prove historical represented length is correct. Even latest-year regional agreement does not validate each individual link.", "noOutcomeFitting": true }, "exposureCatalogue": { "path": "/research/frost/v1/major-road-aadf-exposure-catalogue.csv.gz", "rows": 89476, "bytes": 3093434, "sha256": "e320eea4566e20595f8a1f6c0235f03cfe666f91dc6b1da7cf28352f2001ab61", "rawSha256": "4744c762e10047104cc50cd3d9f4ec54bb76dfc1416e6edb1cb51195be64fdc1", "lsoaEligibleRows": 0 } }