traffic light
signalling device to control competing flows of traffic
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Summary
traffic light is an appliance[1]. It ranks in the top 3% of appliance entities by monthly Wikipedia readership (6,610 views/month).[2]
Key Facts
- Discoverer or inventor: J. P. Knight[3]
- Creator: J. P. Knight[4]
- Subclass of: road traffic control device[5], light source[6], physical sign[7], road equipment[8]
- Part of: transport infrastructure[9]
- Commons category: Traffic signals[10]
- Unicode character: 🚦[11], 🚥[12]
- Inception: 1868[13]
- Topic's main category: Category:Traffic signals[14]
- Commons gallery: Traffic lights[15]
- Location of creation: London[16]
- OpenStreetMap tag: highway=traffic_signals[17], traffic_signals=traffic_light[18]
- Described by source: Armenian Soviet Encyclopedia, vol. 4[19]
- Different from: Semaphore[20], Lanterna (orientamento)[21]
- History of topic: history of traffic lights[22]
- Exact match: http://wordnet-rdf.princeton.edu/wn30/06874185-n[23]
Why It Matters
traffic light has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[24] It is known by 88 alternative names across languages and contexts.[25]