{
  "id": "circuit_alpha",
  "name": "Circuit Alpha",
  "subtitle": "Fictional Grand Prix venue · controlled stress test",
  "kind": "fictional",
  "description": "A fictional but realistically proportioned Grand Prix venue used to prove the FlowTwin engine end to end. Four perimeter exits, six spectator zones, a full concourse ring, three concession clusters and two transport interfaces.",
  "warning_density": 1.8,
  "critical_density": 2.8,
  "nodes": [
    {
      "id": "GS_MAIN",
      "name": "Main Grandstand",
      "type": "grandstand",
      "x": 512,
      "y": 222,
      "area_m2": 9200,
      "holding_capacity": 13000,
      "short_label": "MAIN"
    },
    {
      "id": "GS_NORTH",
      "name": "North Grandstand",
      "type": "grandstand",
      "x": 262,
      "y": 250,
      "area_m2": 5200,
      "holding_capacity": 6500,
      "short_label": "NORTH"
    },
    {
      "id": "GS_TURN1",
      "name": "Turn 1 Grandstand",
      "type": "grandstand",
      "x": 862,
      "y": 262,
      "area_m2": 5600,
      "holding_capacity": 7000,
      "short_label": "TURN 1"
    },
    {
      "id": "GS_EAST",
      "name": "East Grandstand",
      "type": "grandstand",
      "x": 968,
      "y": 468,
      "area_m2": 6100,
      "holding_capacity": 7500,
      "short_label": "EAST"
    },
    {
      "id": "GS_SOUTH",
      "name": "South Grandstand",
      "type": "grandstand",
      "x": 612,
      "y": 686,
      "area_m2": 5800,
      "holding_capacity": 7000,
      "short_label": "SOUTH"
    },
    {
      "id": "GA_WEST",
      "name": "West General Admission",
      "type": "general_admission",
      "x": 160,
      "y": 470,
      "area_m2": 7400,
      "holding_capacity": 8000,
      "short_label": "GA WEST"
    },
    {
      "id": "CON_NORTH",
      "name": "North Concourse",
      "type": "concourse",
      "x": 380,
      "y": 150,
      "area_m2": 3400,
      "short_label": "N CONCOURSE"
    },
    {
      "id": "PLAZA_MAIN",
      "name": "Main Plaza",
      "type": "concourse",
      "x": 616,
      "y": 128,
      "area_m2": 5200,
      "short_label": "MAIN PLAZA"
    },
    {
      "id": "CON_NE",
      "name": "North-East Concourse",
      "type": "concourse",
      "x": 866,
      "y": 156,
      "area_m2": 2900,
      "short_label": "NE CONCOURSE"
    },
    {
      "id": "CON_EAST",
      "name": "East Concourse",
      "type": "concourse",
      "x": 1074,
      "y": 386,
      "area_m2": 3100,
      "short_label": "E CONCOURSE"
    },
    {
      "id": "CON_SE",
      "name": "South-East Concourse",
      "type": "concourse",
      "x": 856,
      "y": 748,
      "area_m2": 2800,
      "short_label": "SE CONCOURSE"
    },
    {
      "id": "CON_SOUTH",
      "name": "South Concourse",
      "type": "concourse",
      "x": 470,
      "y": 800,
      "area_m2": 3000,
      "short_label": "S CONCOURSE"
    },
    {
      "id": "CON_WEST",
      "name": "West Concourse",
      "type": "concourse",
      "x": 120,
      "y": 640,
      "area_m2": 2700,
      "short_label": "W CONCOURSE"
    },
    {
      "id": "CON_NW",
      "name": "North-West Concourse",
      "type": "concourse",
      "x": 106,
      "y": 268,
      "area_m2": 2600,
      "short_label": "NW CONCOURSE"
    },
    {
      "id": "CONC_NORTH",
      "name": "North Fan Zone",
      "type": "concession",
      "x": 742,
      "y": 82,
      "area_m2": 1900,
      "short_label": "FAN ZONE N"
    },
    {
      "id": "CONC_EAST",
      "name": "East Concessions",
      "type": "concession",
      "x": 1136,
      "y": 244,
      "area_m2": 1500,
      "short_label": "CONC E"
    },
    {
      "id": "CONC_SOUTH",
      "name": "South Concessions",
      "type": "concession",
      "x": 646,
      "y": 856,
      "area_m2": 1600,
      "short_label": "CONC S"
    },
    {
      "id": "GATE_A",
      "name": "Gate A",
      "type": "gate",
      "x": 236,
      "y": 64,
      "service_rate_ppm": 1400,
      "short_label": "GATE A"
    },
    {
      "id": "GATE_B",
      "name": "Gate B",
      "type": "gate",
      "x": 1150,
      "y": 118,
      "service_rate_ppm": 1200,
      "short_label": "GATE B"
    },
    {
      "id": "GATE_C",
      "name": "Gate C",
      "type": "gate",
      "x": 1054,
      "y": 830,
      "service_rate_ppm": 1100,
      "short_label": "GATE C"
    },
    {
      "id": "GATE_D",
      "name": "Gate D",
      "type": "gate",
      "x": 122,
      "y": 838,
      "service_rate_ppm": 1000,
      "short_label": "GATE D"
    },
    {
      "id": "EXIT_A",
      "name": "Exit A · North",
      "type": "exit",
      "x": 352,
      "y": 60,
      "area_m2": 900,
      "service_rate_ppm": 1800,
      "short_label": "EXIT A"
    },
    {
      "id": "EXIT_B",
      "name": "Exit B · East",
      "type": "exit",
      "x": 1188,
      "y": 396,
      "area_m2": 760,
      "service_rate_ppm": 760,
      "short_label": "EXIT B",
      "note": "Primary route to the coach and shuttle interchange."
    },
    {
      "id": "EXIT_C",
      "name": "Exit C · South",
      "type": "exit",
      "x": 900,
      "y": 856,
      "area_m2": 820,
      "service_rate_ppm": 1400,
      "short_label": "EXIT C"
    },
    {
      "id": "EXIT_D",
      "name": "Exit D · West",
      "type": "exit",
      "x": 58,
      "y": 726,
      "area_m2": 700,
      "service_rate_ppm": 700,
      "short_label": "EXIT D"
    },
    {
      "id": "TRANSPORT_RAIL",
      "name": "Rail Interchange",
      "type": "transport",
      "x": 470,
      "y": 20,
      "service_rate_ppm": 1500,
      "short_label": "RAIL",
      "area_m2": 4200
    },
    {
      "id": "TRANSPORT_BUS",
      "name": "Coach & Shuttle Interchange",
      "type": "transport",
      "x": 1320,
      "y": 470,
      "service_rate_ppm": 1700,
      "short_label": "COACH",
      "area_m2": 3800
    },
    {
      "id": "PARK_NORTH",
      "name": "North Car Park",
      "type": "parking",
      "x": 118,
      "y": 44,
      "service_rate_ppm": 1100,
      "short_label": "P NORTH",
      "area_m2": 5000
    },
    {
      "id": "PARK_SOUTH",
      "name": "South Car Park",
      "type": "parking",
      "x": 700,
      "y": 900,
      "service_rate_ppm": 1100,
      "short_label": "P SOUTH",
      "area_m2": 5200
    }
  ],
  "edges": [
    {
      "id": "C1_NW_N",
      "source": "CON_NW",
      "target": "CON_NORTH",
      "length_m": 354.5,
      "width_m": 11.0,
      "capacity_ppm": 770.0,
      "kind": "concourse",
      "bidirectional": true,
      "via": [
        [
          190,
          128
        ]
      ]
    },
    {
      "id": "C2_N_PLAZA",
      "source": "CON_NORTH",
      "target": "PLAZA_MAIN",
      "length_m": 237.0,
      "width_m": 13.0,
      "capacity_ppm": 910.0,
      "kind": "concourse",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "C3_PLAZA_NE",
      "source": "PLAZA_MAIN",
      "target": "CON_NE",
      "length_m": 251.6,
      "width_m": 11.0,
      "capacity_ppm": 770.0,
      "kind": "concourse",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "C4_NE_E",
      "source": "CON_NE",
      "target": "CON_EAST",
      "length_m": 365.2,
      "width_m": 12.0,
      "capacity_ppm": 840.0,
      "kind": "concourse",
      "bidirectional": true,
      "via": [
        [
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          216
        ]
      ]
    },
    {
      "id": "C5_E_SE",
      "source": "CON_EAST",
      "target": "CON_SE",
      "length_m": 470.6,
      "width_m": 11.0,
      "capacity_ppm": 770.0,
      "kind": "concourse",
      "bidirectional": true,
      "via": [
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          636
        ]
      ]
    },
    {
      "id": "C6_SE_S",
      "source": "CON_SE",
      "target": "CON_SOUTH",
      "length_m": 397.2,
      "width_m": 10.0,
      "capacity_ppm": 700.0,
      "kind": "concourse",
      "bidirectional": true,
      "via": [
        [
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          812
        ]
      ]
    },
    {
      "id": "C7_S_W",
      "source": "CON_SOUTH",
      "target": "CON_WEST",
      "length_m": 406.7,
      "width_m": 9.0,
      "capacity_ppm": 630.0,
      "kind": "concourse",
      "bidirectional": true,
      "via": [
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          780
        ]
      ]
    },
    {
      "id": "C8_W_NW",
      "source": "CON_WEST",
      "target": "CON_NW",
      "length_m": 382.0,
      "width_m": 9.0,
      "capacity_ppm": 630.0,
      "kind": "concourse",
      "bidirectional": true,
      "via": [
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          448
        ]
      ]
    },
    {
      "id": "A_MAIN_PLAZA",
      "source": "GS_MAIN",
      "target": "PLAZA_MAIN",
      "length_m": 140.2,
      "width_m": 16.0,
      "capacity_ppm": 1120.0,
      "kind": "ramp",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "A_MAIN_NORTH",
      "source": "GS_MAIN",
      "target": "CON_NORTH",
      "length_m": 150.4,
      "width_m": 12.0,
      "capacity_ppm": 840.0,
      "kind": "ramp",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "A_NORTH_CON",
      "source": "GS_NORTH",
      "target": "CON_NORTH",
      "length_m": 154.7,
      "width_m": 11.0,
      "capacity_ppm": 770.0,
      "kind": "ramp",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "A_NORTH_NW",
      "source": "GS_NORTH",
      "target": "CON_NW",
      "length_m": 157.0,
      "width_m": 10.0,
      "capacity_ppm": 700.0,
      "kind": "ramp",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "A_TURN1_NE",
      "source": "GS_TURN1",
      "target": "CON_NE",
      "length_m": 106.1,
      "width_m": 11.0,
      "capacity_ppm": 770.0,
      "kind": "ramp",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "A_TURN1_PLAZA",
      "source": "GS_TURN1",
      "target": "PLAZA_MAIN",
      "length_m": 282.4,
      "width_m": 9.0,
      "capacity_ppm": 630.0,
      "kind": "ramp",
      "bidirectional": true,
      "via": [
        [
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          186
        ]
      ]
    },
    {
      "id": "A_EAST_CON",
      "source": "GS_EAST",
      "target": "CON_EAST",
      "length_m": 134.0,
      "width_m": 12.0,
      "capacity_ppm": 840.0,
      "kind": "ramp",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "A_EAST_NE",
      "source": "GS_EAST",
      "target": "CON_NE",
      "length_m": 350.7,
      "width_m": 8.0,
      "capacity_ppm": 560.0,
      "kind": "ramp",
      "bidirectional": true,
      "via": [
        [
          978,
          300
        ]
      ]
    },
    {
      "id": "A_EAST_SE",
      "source": "GS_EAST",
      "target": "CON_SE",
      "length_m": 309.2,
      "width_m": 7.0,
      "capacity_ppm": 490.0,
      "kind": "ramp",
      "bidirectional": true,
      "via": [
        [
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          620
        ]
      ]
    },
    {
      "id": "A_SOUTH_SE",
      "source": "GS_SOUTH",
      "target": "CON_SE",
      "length_m": 251.8,
      "width_m": 11.0,
      "capacity_ppm": 770.0,
      "kind": "ramp",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "A_SOUTH_S",
      "source": "GS_SOUTH",
      "target": "CON_SOUTH",
      "length_m": 182.1,
      "width_m": 9.0,
      "capacity_ppm": 630.0,
      "kind": "ramp",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "A_GAWEST_W",
      "source": "GA_WEST",
      "target": "CON_WEST",
      "length_m": 174.6,
      "width_m": 12.0,
      "capacity_ppm": 840.0,
      "kind": "ramp",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "A_GAWEST_NW",
      "source": "GA_WEST",
      "target": "CON_NW",
      "length_m": 209.1,
      "width_m": 10.0,
      "capacity_ppm": 700.0,
      "kind": "ramp",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "S_CONC_N",
      "source": "PLAZA_MAIN",
      "target": "CONC_NORTH",
      "length_m": 134.1,
      "width_m": 6.0,
      "capacity_ppm": 420.0,
      "kind": "access",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "S_CONC_N2",
      "source": "CONC_NORTH",
      "target": "CON_NE",
      "length_m": 144.4,
      "width_m": 6.0,
      "capacity_ppm": 420.0,
      "kind": "access",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "S_CONC_E",
      "source": "CON_EAST",
      "target": "CONC_EAST",
      "length_m": 154.9,
      "width_m": 5.5,
      "capacity_ppm": 385.0,
      "kind": "access",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "S_CONC_E2",
      "source": "CONC_EAST",
      "target": "CON_NE",
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      "kind": "access",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "S_CONC_S",
      "source": "CON_SOUTH",
      "target": "CONC_SOUTH",
      "length_m": 184.7,
      "width_m": 5.5,
      "capacity_ppm": 385.0,
      "kind": "access",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "S_CONC_S2",
      "source": "CONC_SOUTH",
      "target": "CON_SE",
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      "width_m": 5.5,
      "capacity_ppm": 385.0,
      "kind": "access",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "X_N_EXITA",
      "source": "CON_NORTH",
      "target": "EXIT_A",
      "length_m": 94.3,
      "width_m": 26.0,
      "capacity_ppm": 1820.0,
      "kind": "gate_link",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "X_E_EXITB",
      "source": "CON_EAST",
      "target": "EXIT_B",
      "length_m": 114.4,
      "width_m": 11.0,
      "capacity_ppm": 770.0,
      "kind": "gate_link",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "X_SE_EXITC",
      "source": "CON_SE",
      "target": "EXIT_C",
      "length_m": 116.6,
      "width_m": 21.0,
      "capacity_ppm": 1470.0,
      "kind": "gate_link",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "X_W_EXITD",
      "source": "CON_WEST",
      "target": "EXIT_D",
      "length_m": 106.0,
      "width_m": 11.0,
      "capacity_ppm": 770.0,
      "kind": "gate_link",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "G_GATEA",
      "source": "GATE_A",
      "target": "CON_NORTH",
      "length_m": 167.7,
      "width_m": 9.0,
      "capacity_ppm": 630.0,
      "kind": "gate_link",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "G_GATEB",
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      "target": "CON_NE",
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      "capacity_ppm": 560.0,
      "kind": "gate_link",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "G_GATEC",
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      "kind": "gate_link",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "G_GATED",
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      "width_m": 8.0,
      "capacity_ppm": 560.0,
      "kind": "gate_link",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "T_EXITA_RAIL",
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      "target": "TRANSPORT_RAIL",
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      "width_m": 21.0,
      "capacity_ppm": 1470.0,
      "kind": "transport_link",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "T_EXITA_PARKN",
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      "capacity_ppm": 840.0,
      "kind": "transport_link",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "T_EXITB_BUS",
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      "kind": "transport_link",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "T_EXITC_BUS",
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      "kind": "transport_link",
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        ],
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        ]
      ]
    },
    {
      "id": "T_EXITC_PARKS",
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      "target": "PARK_SOUTH",
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      "width_m": 12.0,
      "capacity_ppm": 840.0,
      "kind": "transport_link",
      "bidirectional": true,
      "via": []
    },
    {
      "id": "T_EXITD_PARKN",
      "source": "EXIT_D",
      "target": "PARK_NORTH",
      "length_m": 707.6,
      "width_m": 9.0,
      "capacity_ppm": 630.0,
      "kind": "transport_link",
      "bidirectional": true,
      "via": [
        [
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          380
        ],
        [
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          120
        ]
      ]
    },
    {
      "id": "T_EXITD_PARKS",
      "source": "EXIT_D",
      "target": "PARK_SOUTH",
      "length_m": 726.2,
      "width_m": 9.0,
      "capacity_ppm": 630.0,
      "kind": "transport_link",
      "bidirectional": true,
      "via": [
        [
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        ],
        [
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          916
        ]
      ]
    }
  ],
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        ],
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        ]
      ],
      "label": "Circuit Alpha",
      "closed": true
    },
    {
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          390,
          620
        ],
        [
          342,
          566
        ],
        [
          306,
          482
        ],
        [
          292,
          404
        ],
        [
          330,
          358
        ]
      ],
      "label": "",
      "closed": true
    },
    {
      "id": "pit_lane",
      "kind": "building",
      "points": [
        [
          330,
          300
        ],
        [
          700,
          299
        ],
        [
          700,
          316
        ],
        [
          330,
          317
        ]
      ],
      "label": "PIT LANE",
      "closed": true
    },
    {
      "id": "start_line",
      "kind": "label",
      "points": [
        [
          500,
          300
        ],
        [
          500,
          320
        ]
      ],
      "label": "S/F",
      "closed": false
    }
  ],
  "phases": [
    {
      "id": "pre_race",
      "name": "Pre-race",
      "start_s": 0,
      "end_s": 0,
      "description": "Spectators seated, network idle."
    },
    {
      "id": "egress",
      "name": "Post-race egress",
      "start_s": 0,
      "end_s": 1500,
      "description": "Chequered flag: mass departure begins."
    },
    {
      "id": "dispersal",
      "name": "Dispersal",
      "start_s": 1500,
      "end_s": null,
      "description": "Tail of the crowd clearing the network."
    }
  ]
}