{
  "title": "Survive the347 fixed northbound reference course",
  "referencePeriod": "Early2023, before October2023 city NB widening",
  "referenceDescription": "Stylized recreation of familiar two-through-lanes-per-direction SR347, not a live view of current roadworks. City southbound is simplified to two lanes as requested.",
  "actualLengthM": 23874.74,
  "actualLengthMiles": 14.835,
  "recommendedCompression": {
    "physicalDistancePerGameDistance": 10,
    "gameLengthM": 2387.474,
    "note": "Uniform 10:1 physical-distance to game-distance compression. The final game preserves feature proportions and labels game distance separately."
  },
  "coordinateSystem": "WGS84 latitude/longitude degrees",
  "method": "Original OSM polyline follows NB through lanes. Distance uses haversine R6371000m; sampled every100m. Heading is central150m tangent, degrees true north clockwise. Curvature signed degrees/m: positive right, negative left. Sampling smooths mapped vertices; no invented curves.",
  "sources": [
    {
      "id": "osm",
      "title": "OpenStreetMap northbound AZ347 through-road centerline",
      "date": "Data retrieved2026-09-08; not an exact historical extract",
      "url": "https://www.openstreetmap.org/copyright",
      "license": "ODbL1.0; © OpenStreetMap contributors. Share derived route dataset under ODbL and make available for download.",
      "rawFiles": [
        "osm-south.xml",
        "osm-middle.xml",
        "osm-north1.xml",
        "osm-north2.xml",
        "osm-i10.xml"
      ],
      "notes": "Geometry aligned with historical official corridor maps; lane semantics taken from period sources. Node IDs retained in northbound-raw.json. Do not use current OSM lanes or signal tags uncritically."
    },
    {
      "id": "mag-plan",
      "title": "MAG SR347 Corridor Improvement Plan",
      "date": "December2021, existing-condition analysis vs explicitly proposed alternatives",
      "url": "https://azmag.gov/Portals/0/Transportation/SR-347/Scoping-Study/SR-347_Corridor-Improvement-Plan.pdf",
      "pages": "3–4 existing environment,37 traditional I10 diamond,41 T junctions",
      "notes": "Existing river bridges and desert transition; future strategies excluded."
    },
    {
      "id": "adot-2024-script",
      "title": "ADOT corridor projects public meeting script",
      "date": "August2024 (Aug13 in document; filename Aug15)",
      "url": "https://azdot.gov/sites/default/files/2024-08/FINAL_Riggs%20Rd%20347%20Aug%2015%20Script.pdf",
      "pages": "4–8 existing signal types and side directions; explicit NB free through at Old Maricopa",
      "notes": "Existing Casa Blanca/Mammoth standardT; Borgia east access; Old Maricopa FloridaT. Alternatives discussed are not existing conditions."
    },
    {
      "id": "adot-board-map",
      "title": "ADOT State Transportation Board corridor presentation",
      "date": "April11,2025",
      "url": "https://aztransportationboard.gov/sites/default/files/docs/2025/04/item-1-astb-april-meeting-d11-sr347-april-01-2025.pdf",
      "pages": "3–4 source map inspected visually",
      "notes": "Map confirms bends and named junction order. Colored projects represent future work, not reference-period lanes."
    },
    {
      "id": "city-widening-complete",
      "title": "ADOT John Wayne Parkway project complete",
      "date": "June3,2024",
      "url": "https://content.govdelivery.com/accounts/AZDOT/bulletins/3a079e3",
      "notes": "Construction began October2023; third NB lane, Lakeview turn changes and acceleration lane excluded from early2023 game."
    },
    {
      "id": "city-signal-study",
      "title": "Rhythm Engineering MAG automated signal timing evaluation",
      "date": "Study includes December16,2021 observations; document publication date unclear",
      "url": "https://rhythmtraffic.com/downloads/Maricopa_Final_Report_Automated_Signal_Timing_Generator.pdf",
      "notes": "Primary contractor report verifies separate CobblestoneN, CobblestoneS, and Smith/Enke signals."
    },
    {
      "id": "old-maricopa-2022",
      "title": "ADOT Old Maricopa intersection construction bulletin",
      "date": "April22,2022",
      "url": "https://content.govdelivery.com/accounts/AZDOT/bulletins/314b0ef",
      "notes": "2022 installation of signal/acceleration lanes; ADOT2024 confirms resulting existing FloridaT."
    },
    {
      "id": "2023-rsa",
      "title": "ADOT2023 Road Safety Assessment interim improvements",
      "date": "November2023, updated after February2024",
      "url": "https://azdot.gov/sites/default/files/2024-03/fact-sheet-SR347-RSA.pdf",
      "notes": "Later turn-lane restriping/backplates and additional I10 signal head are not included in early2023 detail."
    },
    {
      "id": "aerial-borgia",
      "title": "Esri World Imagery public aerial reference",
      "date": "Retrieved2026-09-08; source imagery capture date not established",
      "url": "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/export?bbox=-112.014,33.14,-112.001,33.166&bboxSR=4326&size=1000,1000&imageSR=4326&format=jpg&f=image",
      "notes": "Inspected as visual corroboration only. Source imagery not republished as game art; do not claim capture date2023."
    },
    {
      "id": "aerial-plant",
      "title": "Esri World Imagery public aerial reference",
      "date": "Retrieved2026-09-08; source imagery capture date not established",
      "url": "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/export?bbox=-112.004,33.171,-111.989,33.183&bboxSR=4326&size=1000,1000&imageSR=4326&format=jpg&f=image",
      "notes": "Inspected as visual corroboration only. Source imagery not republished as game art; do not claim capture date2023."
    },
    {
      "id": "aerial-old-maricopa",
      "title": "Esri World Imagery public aerial reference",
      "date": "Retrieved2026-09-08; source imagery capture date not established",
      "url": "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/export?bbox=-111.982,33.245,-111.968,33.257&bboxSR=4326&size=1000,1000&imageSR=4326&format=jpg&f=image",
      "notes": "Inspected as visual corroboration only. Source imagery not republished as game art; do not claim capture date2023."
    },
    {
      "id": "aerial-i10",
      "title": "Esri World Imagery public aerial reference",
      "date": "Retrieved2026-09-08; source imagery capture date not established",
      "url": "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/export?bbox=-111.955,33.250,-111.943,33.260&bboxSR=4326&size=1000,1000&imageSR=4326&format=jpg&f=image",
      "notes": "Inspected as visual corroboration only. Source imagery not republished as game art; do not claim capture date2023."
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    {
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    {
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  ],
  "features": [
    {
      "id": "smith-enke",
      "name": "Smith-Enke Road / SR 238",
      "lat": 33.0724649,
      "lon": -112.044057,
      "distanceM": 0,
      "kind": "crossroads",
      "connectionSide": "both",
      "signalized": true,
      "northboundThroughStops": true,
      "sources": [
        "osm",
        "city-signal-study"
      ],
      "approximation": "Map-derived point; simplified feature footprint"
    },
    {
      "id": "cobblestone-south",
      "name": "Cobblestone Farms Drive (south entrance)",
      "lat": 33.0757745,
      "lon": -112.0423439,
      "distanceM": 401.19,
      "kind": "t-junction",
      "connectionSide": "west",
      "signalized": true,
      "northboundThroughStops": true,
      "sources": [
        "osm",
        "city-signal-study"
      ],
      "approximation": "Map-derived point; simplified feature footprint"
    },
    {
      "id": "cobblestone-lakeview",
      "name": "Cobblestone Farms Drive / Lakeview Drive",
      "lat": 33.0838465,
      "lon": -112.0381168,
      "distanceM": 1373.02,
      "kind": "crossroads",
      "connectionSide": "west/east",
      "signalized": true,
      "northboundThroughStops": true,
      "sources": [
        "osm",
        "city-signal-study",
        "city-widening-complete"
      ],
      "approximation": "Two mapped signal points combined as one intersection. Cobblestone west, Lakeview east; turning pockets follow pre-October2023 layout."
    },
    {
      "id": "city-edge",
      "name": "Maricopa developed edge",
      "lat": 33.0879386,
      "lon": -112.0359857,
      "distanceM": 1877.85,
      "kind": "terrain-transition",
      "connectionSide": "both",
      "signalized": false,
      "northboundThroughStops": false,
      "sources": [
        "osm",
        "mag-plan"
      ],
      "approximation": "Approximate gradual transition, not a surveyed municipal boundary."
    },
    {
      "id": "santa-rosa",
      "name": "Santa Rosa Wash",
      "lat": 33.094691,
      "lon": -112.0324542,
      "distanceM": 2697.605,
      "kind": "bridge",
      "connectionSide": "both",
      "signalized": false,
      "northboundThroughStops": false,
      "sources": [
        "osm",
        "mag-plan"
      ],
      "approximation": "Bridge from33.0943828,-112.0326190 to33.0949992,-112.0322894; terrain profile schematic.",
      "startM": 2660.05,
      "endM": 2735.16
    },
    {
      "id": "airfield-access",
      "name": "Former airfield access (unnamed)",
      "lat": 33.1074495,
      "lon": -112.0258209,
      "distanceM": 4245.02,
      "kind": "minor-access",
      "connectionSide": "west",
      "signalized": false,
      "northboundThroughStops": false,
      "sources": [
        "osm",
        "mag-plan"
      ],
      "approximation": "Minor access connection; avoid inventing a prominent named road or signal."
    },
    {
      "id": "santa-cruz",
      "name": "Santa Cruz Wash",
      "lat": 33.1219085,
      "lon": -112.0182682,
      "distanceM": 5999.98,
      "kind": "bridge",
      "connectionSide": "both",
      "signalized": false,
      "northboundThroughStops": false,
      "sources": [
        "osm",
        "mag-plan"
      ],
      "approximation": "Bridge from33.1217014,-112.0183779 to33.1221155,-112.0181584. Just south of Casa Blanca.",
      "startM": 5974.79,
      "endM": 6025.17
    },
    {
      "id": "casa-blanca",
      "name": "Casa Blanca Road",
      "lat": 33.1234184,
      "lon": -112.0174719,
      "distanceM": 6183.53,
      "kind": "t-junction",
      "connectionSide": "east",
      "signalized": true,
      "northboundThroughStops": true,
      "sources": [
        "osm",
        "adot-2024-script",
        "mag-plan"
      ],
      "approximation": "Map-derived point; simplified feature footprint"
    },
    {
      "id": "borgia",
      "name": "Borgia Road / Sacate Road",
      "lat": 33.1466272,
      "lon": -112.0069012,
      "distanceM": 8959.33,
      "kind": "t-junction",
      "connectionSide": "east",
      "signalized": false,
      "northboundThroughStops": false,
      "sources": [
        "adot-2024-script",
        "adot-board-map",
        "aerial-borgia"
      ],
      "approximation": "Named junction located by visually checking public aerial reference, then assigned nearest OSM centerline node. Approximately±100m; unpaved side access. A smaller western dirt track is not modeled as a paved major crossroad."
    },
    {
      "id": "gila-river",
      "name": "Gila River",
      "lat": 33.1723446,
      "lon": -112.0051821,
      "distanceM": 11871.869999999999,
      "kind": "bridge",
      "connectionSide": "both",
      "signalized": false,
      "northboundThroughStops": false,
      "sources": [
        "osm",
        "mag-plan"
      ],
      "approximation": "Bridge from33.1707503,-112.0059310 to33.1739388,-112.0044331. Approx382m long, agreeing with MAG1253ft. Dry wash/floodplain depiction does not simulate current water conditions.",
      "startM": 11681.38,
      "endM": 12062.36
    },
    {
      "id": "mammoth",
      "name": "Mammoth Way / cement plant access",
      "lat": 33.1800144,
      "lon": -112.0016882,
      "distanceM": 12784.68,
      "kind": "t-junction",
      "connectionSide": "east",
      "signalized": true,
      "northboundThroughStops": true,
      "sources": [
        "osm",
        "adot-2024-script",
        "adot-board-map",
        "aerial-plant"
      ],
      "approximation": "Map-derived point; simplified feature footprint"
    },
    {
      "id": "goodyear",
      "name": "Goodyear Road (minor track)",
      "lat": 33.1901983,
      "lon": -111.9983162,
      "distanceM": 13959.77,
      "kind": "minor-track",
      "connectionSide": "both",
      "signalized": false,
      "northboundThroughStops": false,
      "sources": [
        "osm"
      ],
      "approximation": "OSM access=private track, not a major signalized intersection; optional sparse dirt-track treatment only."
    },
    {
      "id": "riggs",
      "name": "Riggs Road",
      "lat": 33.2192297,
      "lon": -111.9887923,
      "distanceM": 17307.93,
      "kind": "crossroads",
      "connectionSide": "both",
      "signalized": true,
      "northboundThroughStops": true,
      "sources": [
        "osm",
        "adot-2024-script",
        "adot-board-map"
      ],
      "approximation": "At-grade crossroad in reference period. Do not use proposed grade-separated interchange."
    },
    {
      "id": "old-maricopa",
      "name": "Old Maricopa Road",
      "lat": 33.2499015,
      "lon": -111.9773313,
      "distanceM": 20900.48,
      "kind": "florida-t",
      "connectionSide": "west/northwest",
      "signalized": true,
      "northboundThroughStops": false,
      "sources": [
        "osm",
        "adot-2024-script",
        "old-maricopa-2022",
        "aerial-old-maricopa"
      ],
      "approximation": "Signal controls turns and southbound conflict; northbound through lanes continue free, expressly stated by ADOT. Do not make player stop for side-road signal."
    },
    {
      "id": "i10-near-ramp",
      "name": "I-10 eastbound ramp terminal",
      "lat": 33.2548978,
      "lon": -111.949311,
      "distanceM": 23633.18,
      "kind": "diamond-ramp-terminal",
      "connectionSide": "both",
      "signalized": true,
      "northboundThroughStops": true,
      "sources": [
        "osm",
        "mag-plan",
        "aerial-i10"
      ],
      "approximation": "Traditional diamond interchange; crossing road is Queen Creek Road portion of SR347. No future diverging diamond."
    },
    {
      "id": "i10-bridge",
      "name": "I-10 crossing",
      "lat": 33.2554979,
      "lon": -111.9482201,
      "distanceM": 23712.03,
      "kind": "interchange-bridge",
      "connectionSide": "both",
      "signalized": false,
      "northboundThroughStops": false,
      "sources": [
        "osm",
        "aerial-i10"
      ],
      "approximation": "SR347 crosses over I10; freeway runs northwest/southeast below. Original stylized structures."
    },
    {
      "id": "i10-end",
      "name": "I-10 westbound ramp terminal — leg end",
      "lat": 33.2560916,
      "lon": -111.947141,
      "distanceM": 23874.74,
      "kind": "diamond-ramp-terminal",
      "connectionSide": "both",
      "signalized": true,
      "northboundThroughStops": true,
      "sources": [
        "osm",
        "mag-plan",
        "aerial-i10"
      ],
      "approximation": "End leg after terminal. Do not render Queen Creek Road as endless SR347 continuation."
    }
  ],
  "landmarks": [
    {
      "id": "cement-plant",
      "name": "Cement plant area",
      "lat": 33.1748,
      "lon": -111.9927,
      "side": "east/southeast of Mammoth junction",
      "approximation": "Schematic industrial footprint from public aerial reference; no claim of exact equipment or truck movements",
      "sources": [
        "adot-board-map",
        "aerial-plant"
      ]
    }
  ],
  "historicalGeometryValidation": {
    "checked": "2026-09-08",
    "wayIds": [
      528585482,
      528586901,
      136546808
    ],
    "finding": "Node sequences for main S-bends, north straight and I10 approach identical to pre-January2023 versions; main S-bend node coordinates all predate2023; Old Maricopa node2026 edit retained coordinates exactly. One north-straight node received a3m map refinement September2023. Full-corridor historical extract unavailable.",
    "urls": [
      "https://api.openstreetmap.org/api/0.6/way/528585482/history",
      "https://api.openstreetmap.org/api/0.6/way/528586901/history",
      "https://api.openstreetmap.org/api/0.6/way/136546808/history",
      "https://api.openstreetmap.org/api/0.6/node/1497855491/history",
      "https://api.openstreetmap.org/api/0.6/node/4857032030/history"
    ]
  }
}