Traffic Signal Systems
Semaphore, lamp, and early electric controls for coordinating street traffic, rail crossings, pedestrians, and urban intersections.
Core metadata
- ID: traffic_signal_systems
- Era: Industrial
- First known date: 1914 (exact)
- Region: Cleveland, Ohio, United States
- Review status: source_checked
- Maturity: N/A
Prerequisites
- Mass-Produced Automobile (automobile_mass_production)
- Electric Railway Signaling (electric_railway_signaling)
- Urban Mass Transit Networks (urban_mass_transit_networks)
Dependents
- None.
Fields
- None.
Node sources
- Early Electric Traffic Signals in Cleveland (Cleveland Police Museum, 2023, museum) • Supports: node
Locator: The Cleveland Police Museum dates early electric traffic signals in Cleveland to 1914, installed by the American Traffic Signal Company.
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 3
- Average edge confidence: 68%
- Prerequisite sources: 0
- expert_inference: 3
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Electric Railway Signaling (electric_railway_signaling) | enabling | 68% | expert_inference | Electric Railway Signaling provides a capability that enables this technology without being the only possible path. | No sources recorded. |
| Mass-Produced Automobile (automobile_mass_production) | enabling | 68% | expert_inference | Mass-Produced Automobile provides a capability that enables this technology without being the only possible path. | No sources recorded. |
| Urban Mass Transit Networks (urban_mass_transit_networks) | enabling | 68% | expert_inference | Urban Mass Transit Networks provides a capability that enables this technology without being the only possible path. | No sources recorded. |
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