{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.traffic-light","code":"thing-q8004","url":"https://ver.cy/models/thing/q8004/","name":"traffic light","alternateNames":["Traffic lights in Korea","fixed-time traffic light","temporary traffic lights","traffic signals in Poland","pedestrian signal","flashing single‑lamp signal","speed sign","ramp meter","In-ground crossing light","traffic lights in Japan","solar traffic light"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.OBJ"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"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.","purpose":"Let an agent handle traffic lights by type, signal meaning, timing, accessibility and faults, with road rules by country.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Controls traffic by coloured lights","Fixed-time or adaptive","Signal meanings vary by country","Accessible signals help blind pedestrians"],"structure":{"bundles":[{"id":"meaning","name":"Meaning","description":"What signals mean.","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.","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.","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.","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"}]}]}]}]},"agentConduct":{"may":["Read a traffic light's state and obey it.","Report faulty, dark or obscured signals to the road authority."],"mustNot":["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."],"requiresHuman":["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."],"affectedParties":["Drivers and riders","Pedestrians and cyclists","Emergency services"]},"owners":{"steward":"The road or highway authority that installs and operates it.","roles":[],"masterSystems":["Road authority asset and traffic signal registers"]},"relations":[{"target":"Q105449313","type":"parent","note":"registry parent class"},{"target":"Q1146001","type":"parent","note":"registry parent class"},{"target":"Q2354362","type":"parent","note":"registry parent class"},{"target":"Q7339568","type":"parent","note":"registry parent class"},{"target":"road equipment and physical sign","type":"related","note":"category"},{"target":"road traffic","type":"related","note":"use"},{"target":"intersection","type":"related","note":"place"},{"target":"road traffic rules","type":"related","note":"rules"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.traffic-light","Wikidata: Q8004 (https://www.wikidata.org/wiki/Q8004)"]},"properties":{"applicability":"required","items":["Signal aperture diameter:  mm - Measure the diameter of the visible illuminated aperture, distinguishing vehicle signals from pedestrian displays.","Luminous intensity:  cd - Measure luminous intensity at specified viewing angles with calibrated photometric equipment.","Mounting height:  m - Measure vertically from the road or footway surface to a stated reference point on the signal head.","Electrical power consumption:  W - Measure electrical input power for the specified illuminated aspect and operating condition."]},"recognition":{"applicability":"required","items":["Red, amber, green lamps","Arrow and pedestrian signals","Temporary portable lights at roadworks","Poles or gantries with red, amber and green lamps and pedestrian figures."]},"capabilities":{"applicability":"required","items":["obey signals","report faults to the road authority","plan signal timing","provide accessible pedestrian signals"]},"hazards":{"applicability":"required","items":["Signal failures at busy junctions","Running red lights","Short pedestrian crossing times"]},"interfaces":{"applicability":"required","items":["Vienna Convention on Road Signs and Signals","EN 12368 traffic control equipment","National traffic signal manuals such as MUTCD"]},"context":{"applicability":"required","items":["Controlling conflicting traffic flows safely.","fixed-time signals","actuated and adaptive signals","pedestrian and cycle signals","temporary traffic lights","flashing warning signals"]}},"sources":[{"title":"Wikidata item Q8004: traffic light","url":"https://www.wikidata.org/wiki/Q8004","note":"identity and sense of the item"},{"title":"Wikipedia: Traffic light","url":"https://en.wikipedia.org/wiki/Traffic_light","note":"general description of the item"}],"openQuestions":["Should signal types be separate entries?","How should country rules be linked?","How should fault reporting be localised?"],"resources":{"spec":"/models/things/publications/thing-q8004/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q8004/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T07:27:59Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:32+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}