{ "phase": "E6", "snapshotDate": "2026-10-11", "frozenAt": "2026-10-12", "status": "Nationwide extraction completed; coverage-gated provisional features; no historical limit reconstruction", "masterRows": 35672, "statusCounts": { "insufficient_speed_coverage": 34125, "provisional": 1547 }, "country": { "England": { "lsoas": 33755, "insufficient_speed_coverage": 32287, "totalRoadMetres": 416782733.3188837, "classifiedRoadMetres": 171629262.6985495, "provisional": 1468 }, "Wales": { "lsoas": 1917, "insufficient_speed_coverage": 1838, "totalRoadMetres": 46659207.37438995, "classifiedRoadMetres": 15128282.183187896, "provisional": 79 } }, "regions": { "London": { "lsoas": 4994, "insufficient_speed_coverage": 4438, "totalRoadMetres": 19600148.183802042, "classifiedRoadMetres": 11824824.003729356, "provisional": 556 }, "North West": { "lsoas": 4567, "insufficient_speed_coverage": 4041, "totalRoadMetres": 50533695.61061691, "classifiedRoadMetres": 26386275.097712196, "provisional": 526 }, "Yorkshire and The Humber": { "lsoas": 3355, "insufficient_speed_coverage": 3310, "totalRoadMetres": 43583045.27837653, "classifiedRoadMetres": 15116851.497222496, "provisional": 45 }, "North East": { "lsoas": 1682, "insufficient_speed_coverage": 1666, "totalRoadMetres": 22413572.95601281, "classifiedRoadMetres": 7899174.433903864, "provisional": 16 }, "West Midlands": { "lsoas": 3574, "insufficient_speed_coverage": 3531, "totalRoadMetres": 46393012.57063819, "classifiedRoadMetres": 13954287.894432602, "provisional": 43 }, "East Midlands": { "lsoas": 2847, "insufficient_speed_coverage": 2830, "totalRoadMetres": 42780584.740129426, "classifiedRoadMetres": 14399252.148240654, "provisional": 17 }, "South West": { "lsoas": 3407, "insufficient_speed_coverage": 3374, "totalRoadMetres": 68436389.04770803, "classifiedRoadMetres": 20783516.410240747, "provisional": 33 }, "East of England": { "lsoas": 3758, "insufficient_speed_coverage": 3692, "totalRoadMetres": 55220734.41087721, "classifiedRoadMetres": 28802525.2633897, "provisional": 66 }, "South East": { "lsoas": 5571, "insufficient_speed_coverage": 5405, "totalRoadMetres": 67821550.52072258, "classifiedRoadMetres": 32462555.949679136, "provisional": 166 }, "Wales": { "lsoas": 1917, "insufficient_speed_coverage": 1838, "totalRoadMetres": 46659207.37438995, "classifiedRoadMetres": 15128282.183187896, "provisional": 79 } }, "sourceNetworkRoadMetresWithinEW": 463441940.6932461, "sourceExtractRoadMetresOutsideEW": 170289.66078845735, "roadsProcessed": 3130653, "unknownReasonRoadMetres": { "untagged": 273300782.84959304, "unparsed": 1455923.9936202397, "variable": 1559637.05542219, "conditional": 363266.34465129516, "directional_unresolved": 4749.503365908609, "lane_specific": 36.064895889214625 }, "roadClassCoverage": [ { "country": "England", "highway": "living_street", "totalMetres": 613105.7509630736, "classifiedMetres": 194326.44317523294 }, { "country": "England", "highway": "motorway", "totalMetres": 5969494.202551164, "classifiedMetres": 4748700.027107303 }, { "country": "England", "highway": "motorway_link", "totalMetres": 1192462.8680016077, "classifiedMetres": 904021.38624153 }, { "country": "England", "highway": "primary", "totalMetres": 18617426.955940492, "classifiedMetres": 17231580.899690337 }, { "country": "England", "highway": "primary_link", "totalMetres": 252637.19235838574, "classifiedMetres": 210649.13964297538 }, { "country": "England", "highway": "residential", "totalMetres": 120232409.7029573, "classifiedMetres": 48421664.15769925 }, { "country": "England", "highway": "secondary", "totalMetres": 20398179.303894494, "classifiedMetres": 16412746.45610995 }, { "country": "England", "highway": "secondary_link", "totalMetres": 66344.54563596251, "classifiedMetres": 49896.95598040148 }, { "country": "England", "highway": "service", "totalMetres": 89888985.99687797, "classifiedMetres": 3772584.5129182315 }, { "country": "England", "highway": "tertiary", "totalMetres": 50563269.26735989, "classifiedMetres": 31065052.97394287 }, { "country": "England", "highway": "tertiary_link", "totalMetres": 119967.47211795015, "classifiedMetres": 68654.16978553399 }, { "country": "England", "highway": "trunk", "totalMetres": 21562964.92722772, "classifiedMetres": 21138793.20998183 }, { "country": "England", "highway": "trunk_link", "totalMetres": 1661896.7185430538, "classifiedMetres": 1390291.9679833795 }, { "country": "England", "highway": "unclassified", "totalMetres": 85643588.41445965, "classifiedMetres": 26020300.398289822 }, { "country": "Wales", "highway": "living_street", "totalMetres": 9216.047380230646, "classifiedMetres": 3381.676156035051 }, { "country": "Wales", "highway": "motorway", "totalMetres": 264202.1832553903, "classifiedMetres": 224792.00441665752 }, { "country": "Wales", "highway": "motorway_link", "totalMetres": 52576.75768399077, "classifiedMetres": 42998.42336679348 }, { "country": "Wales", "highway": "primary", "totalMetres": 2807551.4151294557, "classifiedMetres": 2476716.399028097 }, { "country": "Wales", "highway": "primary_link", "totalMetres": 27784.414153051704, "classifiedMetres": 22660.99851482385 }, { "country": "Wales", "highway": "residential", "totalMetres": 7878113.97073585, "classifiedMetres": 4203528.290190427 }, { "country": "Wales", "highway": "secondary", "totalMetres": 3034565.5889670844, "classifiedMetres": 2183175.7278847382 }, { "country": "Wales", "highway": "secondary_link", "totalMetres": 3326.073861089723, "classifiedMetres": 2058.767129894028 }, { "country": "Wales", "highway": "service", "totalMetres": 11451736.393249447, "classifiedMetres": 592602.7729050668 }, { "country": "Wales", "highway": "tertiary", "totalMetres": 3626712.772701045, "classifiedMetres": 1490891.830619879 }, { "country": "Wales", "highway": "tertiary_link", "totalMetres": 4964.813134787064, "classifiedMetres": 2196.7557517539217 }, { "country": "Wales", "highway": "trunk", "totalMetres": 2075838.1867009045, "classifiedMetres": 2030540.6012050488 }, { "country": "Wales", "highway": "trunk_link", "totalMetres": 124887.62600684637, "classifiedMetres": 105347.8094473557 }, { "country": "Wales", "highway": "unclassified", "totalMetres": 15297731.131430708, "classifiedMetres": 1747390.1265712662 } ], "boundarySha256": "3f9e1af25956e4e0bf28e3a3823af44ce7c315cad19c50660ab99352cdf23969", "aggregateSha256": "bd16d5992efb9d29cd985f36135d32de2bb0620ece5aae040df5c84cc2d20bc0", "extraction": { "parserVersion": 2, "sourceHashes": [ "16959e0317e09e187a21ba5118d30045884dd4187e6f3a189d4a07565215e966", "e730b9e65a40bd5160d241599a3d18d48321e8afdb24c7df45c67734b35ad7ab" ], "counts": { "included": 3130653, "classified": 1062499, "untagged": 2051990, "excluded_scope": 1112703, "unparsed": 9664, "variable": 3432, "conditional": 3038, "directional_unresolved": 28, "lane_specific": 2, "duplicate_way": 2014 }, "maxspeedTags": { "": 2061047, "30 mph": 456365, "20 mph": 347793, "60 mph": 96236, "40 mph": 83137, "70 mph": 35578, "50 mph": 29826, "10 mph": 9225, "5 mph": 6720, "15 mph": 2720, "none": 1252, "25 mph": 162, "20": 109, "GB:nsl_single": 65, "12 mph": 49, "30": 46, "50": 45, "20mph": 40, "15": 37, "4 mph": 30, "40": 19, "10": 14, "3 mph": 12, "38 mph": 10, "5": 9, "25": 8, "2 mph": 7, "30mph": 7, "60": 7, "11 mph": 7, "8 mph": 6, "45": 6, "9 mph": 5, "32": 5, "7": 4, "8": 4, "29 mph": 4, "35 mph": 4, "8.75 mph": 4, "39 mph": 3, "64": 2, "65 mph": 2, "60mph": 2, "16": 2, "9.75 mph": 2, "1 mph": 2, "signals": 2, "2\"": 1, "67 mph": 1, "3": 1, "45 mph": 1, "28 mph": 1, "18 mph": 1, "80 mph": 1, "30 mpg": 1, "6 mph": 1, "13 mph": 1, "3020 mph": 1, "40mph": 1 }, "pbfHeaders": { "england.osm.pbf": { "osmosis_replication_timestamp": "2026-10-11T20:21:06Z", "generator": "osmium/1.16.0", "osmosis_replication_sequence_number": "4930" }, "wales.osm.pbf": { "osmosis_replication_timestamp": "2026-10-11T20:21:06Z", "generator": "osmium/1.16.0", "osmosis_replication_sequence_number": "4930" } }, "roadsSha256": "32956169e3a27958bd95c8f6af81a88e360d5d126ca8d2de50aa06a9dd936b60" }, "coverageGate": 0.95, "denominator": "Sum of lengths of mapped in-scope public motor-road ways, clipped to LSOA polygons in EPSG:27700; dual carriageways retain separately mapped carriageways, not lane-km.", "numerator": "Length with a decoded fixed general-car limit <=20mph or <=30mph.", "featureFormula": "100 * threshold road length / classified road length, published only at >=95% classified share.", "boundsFormula": "Lower=threshold length/total length; upper=(threshold length+unknown length)/total length. Bounds cover speed-tag uncertainty, not omitted OSM roads.", "scope": { "highways": [ "living_street", "motorway", "motorway_link", "primary", "primary_link", "residential", "secondary", "secondary_link", "service", "tertiary", "tertiary_link", "trunk", "trunk_link", "unclassified" ], "excludedService": [ "drive-through", "driveway", "emergency_access", "parking_aisle" ], "excludedAccess": [ "agricultural", "customers", "delivery", "forestry", "military", "no", "permit", "private" ], "accessPrecedence": [ "motorcar", "motor_vehicle", "vehicle", "access" ], "scopeLimitation": "A crowdsourced mapped-road proxy; absence of access restrictions does not certify public legal status. Omitted roads are not measured by the 95% tag-coverage gate." }, "parsing": { "numeric": "mph explicit; unqualified numbers km/h converted using 1.609344 km/mile", "symbolic": "Only explicitly tagged GB/UK nsl_single=60, nsl_dual/motorway=70 mph; restricted/urban symbolic values not inferred", "conditional": "General conditional speed/access/oneway tags, variable and lane-specific limits unknown; no time weighting", "directional": "One-way forward or reverse picks permitted direction; two-way roads require same parsed limit in both directions; unresolved/different directions unknown", "vehicleSpecific": "HGV/bus/trailer restrictions do not override the general-car feature", "defaults": "No inference from residential class, country, lighting or collision records" }, "temporalEligibility": "Contemporary descriptive context only. A mapped editing date is not an effective legal limit date. Exclude from earlier-year as-of forecasting; historic effective dates require a separate validated source.", "authorityValidation": { "status": "Policy-vintage check only; segment-level matched authoritative validation remains outstanding", "sources": [ { "url": "https://www.gov.wales/introducing-default-20mph-speed-limits", "checkedAt": "2026-10-12", "finding": "Welsh restricted-road default changed in September 2023; blanket UK 30mph assumptions invalid." }, { "url": "https://datamap.gov.wales/layers/geonode:national_20mph_restricted/metadata_detail", "publicationDate": "2022-10-24", "finding": "Proposed transition layer precedes implementation and later TRO reviews; not a validated current network." }, { "url": "https://tfw.wales/vehicle-speed-monitoring-data-july-2023-to-september-2025", "publishedAt": "2025-12-17", "finding": "Five Wrexham monitoring sites reverted from 20mph to 30mph between July and September 2025. Dated site changes demonstrate why the 2026 snapshot cannot be assigned to earlier years." } ], "evidenceFile": "inputs/speed-authority-evidence.json" }, "licence": "\u00a9 OpenStreetMap contributors; derived database ODbL 1.0 https://opendatacommons.org/licenses/odbl/1-0/; ONS boundary licence separately retained.", "outcomesUsed": false, "historicalAsOfEligible": false, "classifiedRoadMetres": 186757544.88173681, "urbanRural": { "Urban": { "lsoas": 29557, "insufficient_speed_coverage": 28037, "totalRoadMetres": 223210150.95466664, "classifiedRoadMetres": 100069866.21323963, "provisional": 1520 }, "Rural": { "lsoas": 6115, "insufficient_speed_coverage": 6088, "totalRoadMetres": 240231789.73860773, "classifiedRoadMetres": 86687678.6684983, "provisional": 27 } } }