{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-11T07:27:59Z",
    "providers": [
      "Claude"
    ],
    "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify",
    "pass": 2,
    "wave": 1,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-05T16:30:00Z",
      "ingestedAt": "2026-10-05T13:18:59+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-07T10:10:32+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q8004",
    "registryId": "vr.tr.traffic-light",
    "name": "traffic light",
    "version": "0.2.0-wave.1",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "PHY.OBJ"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q8004/",
  "model": {
    "registry_id": "vr.tr.traffic-light",
    "name": "traffic light",
    "purpose": "Let an agent handle traffic lights by type, signal meaning, timing, accessibility and faults, with road rules by country.",
    "definition": "A signalling device at road intersections, pedestrian crossings and other locations that controls traffic with coloured lights, usually red, amber and green, and pedestrian signals.",
    "what_it_is_for": "Controlling conflicting traffic flows safely.",
    "affordances": [
      "obey signals",
      "report faults to the road authority",
      "plan signal timing",
      "provide accessible pedestrian signals"
    ],
    "distinguishing_features": [
      "Controls traffic by coloured lights",
      "Fixed-time or adaptive",
      "Signal meanings vary by country",
      "Accessible signals help blind pedestrians"
    ],
    "appearance": "Poles or gantries with red, amber and green lamps and pedestrian figures.",
    "visual_identification": [
      "Red, amber, green lamps",
      "Arrow and pedestrian signals",
      "Temporary portable lights at roadworks"
    ],
    "physical_properties": [
      {
        "quantity": "Signal aperture diameter",
        "unit": "mm",
        "typical_range": "",
        "note": "Measure the diameter of the visible illuminated aperture, distinguishing vehicle signals from pedestrian displays."
      },
      {
        "quantity": "Luminous intensity",
        "unit": "cd",
        "typical_range": "",
        "note": "Measure luminous intensity at specified viewing angles with calibrated photometric equipment."
      },
      {
        "quantity": "Mounting height",
        "unit": "m",
        "typical_range": "",
        "note": "Measure vertically from the road or footway surface to a stated reference point on the signal head."
      },
      {
        "quantity": "Electrical power consumption",
        "unit": "W",
        "typical_range": "",
        "note": "Measure electrical input power for the specified illuminated aspect and operating condition."
      }
    ],
    "families_and_kinds": [
      "fixed-time signals",
      "actuated and adaptive signals",
      "pedestrian and cycle signals",
      "temporary traffic lights",
      "flashing warning signals"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "road equipment and physical sign",
        "why": "category"
      },
      {
        "relation": "controls",
        "target": "road traffic",
        "why": "use"
      },
      {
        "relation": "is installed at",
        "target": "intersection",
        "why": "place"
      },
      {
        "relation": "is governed by",
        "target": "road traffic rules",
        "why": "rules"
      }
    ],
    "identifiers": [],
    "standards_and_regulation": [
      "Vienna Convention on Road Signs and Signals",
      "EN 12368 traffic control equipment",
      "National traffic signal manuals such as MUTCD"
    ],
    "failure_modes_and_hazards": [
      "Signal failures at busy junctions",
      "Running red lights",
      "Short pedestrian crossing times"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Read a traffic light's state and obey it.",
        "Report faulty, dark or obscured signals to the road authority."
      ],
      "must_not": [
        "Change the timing or state of traffic lights without the road authority's authority.",
        "Proceed against a red signal except when directed by police or an emergency procedure.",
        "Interfere with signal priority systems for emergency or public transport vehicles.",
        "Treat a dark or flashing signal as a green light."
      ],
      "requires_human": [
        "Overriding signals during an emergency or an incident.",
        "Changing pedestrian crossing timings."
      ]
    },
    "ethics": {
      "considerations": [
        "Signal faults and tampering cause collisions that kill and injure people.",
        "Signal timings shape safety and waiting time for pedestrians, the elderly and disabled people."
      ],
      "affected_parties": [
        "Drivers and riders",
        "Pedestrians and cyclists",
        "Emergency services"
      ]
    },
    "owners": {
      "steward": "The road or highway authority that installs and operates it.",
      "master_systems": [
        "Road authority asset and traffic signal registers"
      ]
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q8004: traffic light",
      "url": "https://www.wikidata.org/wiki/Q8004",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Traffic light",
      "url": "https://en.wikipedia.org/wiki/Traffic_light",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "meaning",
        "name": "Meaning",
        "description": "What signals mean.",
        "rationale": "Meanings vary by country.",
        "layers": [
          {
            "id": "colours",
            "name": "Colours",
            "description": "Red, amber, green.",
            "findings": [
              {
                "id": "colours-finding",
                "name": "Colours",
                "description": "Signal meaning.",
                "questions": [
                  {
                    "text": "What does each signal mean in this country?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Is right turn on red allowed?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "arrows",
            "name": "Arrows",
            "description": "Filters.",
            "findings": [
              {
                "id": "arrows-finding",
                "name": "Arrows",
                "description": "Arrow signals.",
                "questions": [
                  {
                    "text": "What do arrow signals permit?",
                    "kind": "definition"
                  },
                  {
                    "text": "Do pedestrians have priority?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "operation",
        "name": "Operation",
        "description": "Timing.",
        "rationale": "Timing affects safety.",
        "layers": [
          {
            "id": "timing",
            "name": "Timing",
            "description": "Cycles.",
            "findings": [
              {
                "id": "timing-finding",
                "name": "Timing",
                "description": "Timing.",
                "questions": [
                  {
                    "text": "Is the signal fixed-time or adaptive?",
                    "kind": "definition"
                  },
                  {
                    "text": "What is the cycle length?",
                    "kind": "measurement"
                  }
                ]
              }
            ]
          },
          {
            "id": "pedestrians",
            "name": "Pedestrians",
            "description": "Crossing time.",
            "findings": [
              {
                "id": "pedestrians-finding",
                "name": "Pedestrians",
                "description": "Pedestrian timing.",
                "questions": [
                  {
                    "text": "Is crossing time long enough for slower pedestrians?",
                    "kind": "boundary"
                  },
                  {
                    "text": "Which standard walking speed is assumed?",
                    "kind": "measurement"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "accessibility",
        "name": "Accessibility",
        "description": "Inclusive signals.",
        "rationale": "Signals should be accessible.",
        "layers": [
          {
            "id": "audible",
            "name": "Audible and tactile",
            "description": "Signals for blind people.",
            "findings": [
              {
                "id": "audible-finding",
                "name": "Audible",
                "description": "Accessible signals.",
                "questions": [
                  {
                    "text": "Does the crossing have audible or tactile signals?",
                    "kind": "definition"
                  },
                  {
                    "text": "How can they be requested?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "colour",
            "name": "Colour vision",
            "description": "Position cues.",
            "findings": [
              {
                "id": "colour-finding",
                "name": "Colour",
                "description": "Colour vision.",
                "questions": [
                  {
                    "text": "Can people with colour vision deficiency read the signal by position?",
                    "kind": "boundary"
                  },
                  {
                    "text": "Is the layout standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "faults",
        "name": "Faults",
        "description": "Failures.",
        "rationale": "Failures need rules.",
        "layers": [
          {
            "id": "failure",
            "name": "Failure",
            "description": "What to do.",
            "findings": [
              {
                "id": "failure-finding",
                "name": "Failure",
                "description": "Signal failure.",
                "questions": [
                  {
                    "text": "What are the rules when lights are out?",
                    "kind": "provenance"
                  },
                  {
                    "text": "How should drivers proceed?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "reporting",
            "name": "Reporting",
            "description": "Road authority.",
            "findings": [
              {
                "id": "reporting-finding",
                "name": "Reporting",
                "description": "Fault reporting.",
                "questions": [
                  {
                    "text": "How can a fault be reported?",
                    "kind": "action"
                  },
                  {
                    "text": "To which authority?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should signal types be separate entries?",
    "How should country rules be linked?",
    "How should fault reporting be localised?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}