{
  "retrievedAt": "2026-09-22",
  "sourceDate": "2026-07-15",
  "osmTimestamp": "2026-07-15T15:22:01Z",
  "source": "https://overpass.private.coffee/api/interpreter",
  "query": "[out:json][timeout:180][maxsize:536870912];rel[route=road][network~\"^JP:prefectural\"]->.routes;.routes >> ->.members;(.routes;rel.members;);out body;way.members;out geom;",
  "sha256": "0d0d8c676e7844346397ec0a78d1bdd9c6bdce9211f8c75361216b62ae186cdb",
  "license": "ODbL 1.0",
  "sourceRelations": 6151,
  "roads": 6149,
  "excluded": [
    {
      "relationId": 15018085,
      "reason": "prefecture unresolved"
    },
    {
      "relationId": 21072595,
      "reason": "no usable road geometry"
    }
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  "counts": {
    "北海道": 785,
    "青森県": 16,
    "岩手県": 63,
    "宮城県": 30,
    "秋田県": 9,
    "山形県": 3,
    "福島県": 17,
    "茨城県": 217,
    "栃木県": 25,
    "群馬県": 139,
    "埼玉県": 55,
    "千葉県": 41,
    "東京都": 159,
    "神奈川県": 163,
    "新潟県": 20,
    "富山県": 3,
    "石川県": 46,
    "福井県": 8,
    "山梨県": 22,
    "長野県": 145,
    "岐阜県": 34,
    "静岡県": 66,
    "愛知県": 162,
    "三重県": 72,
    "滋賀県": 85,
    "京都府": 294,
    "大阪府": 187,
    "兵庫県": 486,
    "奈良県": 173,
    "和歌山県": 185,
    "鳥取県": 219,
    "島根県": 236,
    "岡山県": 372,
    "広島県": 361,
    "山口県": 263,
    "徳島県": 206,
    "香川県": 188,
    "愛媛県": 241,
    "高知県": 190,
    "福岡県": 42,
    "佐賀県": 163,
    "長崎県": 126,
    "熊本県": 90,
    "大分県": 18,
    "宮崎県": 10,
    "鹿児島県": 18,
    "沖縄県": 124
  },
  "method": "OSM road relations tagged JP:prefectural; recursively collect and deduplicate member ways within each relation, omit construction/proposed/abandoned ways and ferries. Preserve disconnected geometry. Route identities are OSM relation IDs, not an official route census. Every route is marked partial because complete legal-route coverage is unverified. Length sums mapped ways, including separate carriageways/branches, and is not official road length. No designation/opening years inferred.",
  "boundaries": {
    "source": "https://raw.githubusercontent.com/nvkelso/natural-earth-vector/master/geojson/ne_10m_admin_1_states_provinces.geojson",
    "license": "public domain",
    "use": "Only for routes without prefecture name/network tags; approximate geographic assignment."
  }
}