#light.visual_signal  a visual warning signal; "they saw the light of the beacon"; "there was a light at every corner"
  supertype:  visual_signal  a signal that involves visual communication
  subtype:  traffic_light__trafficlight__traffic_signal__trafficsignal__stoplight  a visual signal to control the flow of traffic at intersections
     subtype:  green_light__greenlight__go-ahead  the signal to proceed
     subtype:  red_light  the signal to stop
     subtype:  yellow_light  the signal to proceed with caution

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