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  "slug": "why-traffic-lights-introduced-automated-flow",
  "version": 1,
  "layout": "comparison",
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      "id": "n1",
      "type": "zone",
      "label": "Uncontrolled Intersection",
      "x": 56,
      "y": 92,
      "w": 155,
      "h": 155,
      "detail": "gridlock / collision"
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      "id": "n2",
      "type": "divider",
      "label": "→",
      "x": 271,
      "y": 112,
      "w": 24,
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      "id": "n3",
      "type": "dial",
      "label": "Signal Sequence",
      "x": 328,
      "y": 100,
      "w": 155,
      "h": 155,
      "detail": "Red / Amber / Green"
    },
    {
      "id": "n4",
      "type": "zone",
      "label": "Orderly Flow",
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      "y": 279,
      "w": 78,
      "h": 78,
      "detail": "time-shared access"
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    {
      "id": "n5",
      "type": "sign",
      "label": "No Officer Needed",
      "x": 336,
      "y": 312,
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      "from": "n1",
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      "label": "replaced by"
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      "label": "enables"
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      "from": "n3",
      "to": "n5",
      "label": "because"
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  "summary": "A timed three-phase signal gives each direction exclusive time-slot access, removing human direction.",
  "mechanism": "timed-phase-conflict-resolution",
  "fig": "FIG. / THE SIGNAL THAT MOVED WITHOUT A PERSON BEHIND IT",
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    "duration": 600,
    "stagger": 60
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  "presentation": {
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    "hero": "n4",
    "support": [
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    "icon": "traffic-light",
    "label": "Traffic light",
    "tilt": 0
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  "illustration": {
    "concept": "Four-way road intersection with traffic light on post; red light stops cars on north-south axis; east-west traffic flows through with motion arrow",
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