{
  "scope": "authored three-line and shared-entry topology; no source bay dimension adopted",
  "line_destinations": {
    "L1": "destination-1",
    "L2": "destination-2",
    "L3": "destination-3"
  },
  "turns": [
    {
      "id": "preserved",
      "incoming_order": [
        "L1",
        "L2",
        "L3"
      ],
      "outgoing_order": [
        "L1",
        "L2",
        "L3"
      ],
      "section_conventions": {
        "incoming": "top to bottom",
        "outgoing": "right to left"
      },
      "levels": {
        "L1": "z0",
        "L2": "z0",
        "L3": "z0"
      }
    },
    {
      "id": "permuted",
      "incoming_order": [
        "L1",
        "L2",
        "L3"
      ],
      "outgoing_order": [
        "L3",
        "L2",
        "L1"
      ],
      "levels_through_reorder": {
        "L1": "z1",
        "L2": "z0",
        "L3": "z2"
      },
      "connection_at_plan_crossing": false,
      "levels": "symbolic; rise/fall routing and actual clearances unresolved"
    }
  ],
  "entries": [
    {
      "id": "aligned",
      "north_departure": "N",
      "south_entry": "Q",
      "occupied_segments": {
        "N": "S",
        "Q": "S"
      },
      "conflict": "compete for same entry corridor"
    },
    {
      "id": "staggered",
      "north_departure": "N",
      "south_entry": "Q",
      "occupied_segments": {
        "N": "S",
        "Q": "T"
      },
      "response": "separate station for Q, no prescribed bay shift"
    }
  ],
  "verification": [
    "line identity/destination continuity",
    "plan and section",
    "actual approach occupancy",
    "support/fitting/movement envelopes",
    "future lanes"
  ],
  "coordinate_unit": "SVG drawing units only"
}