#traffic.aggregation  the aggregation of things (pedestrians or vehicles or messages) coming and going in a particular locality
  supertype:  #aggregation__collection__accumulation__assemblage  several things grouped together
  subtype:  #commuter_traffic  traffic created by people going to or returning from work
  subtype:  #pedestrian_traffic__foot_traffic  people coming and going on foot
  subtype:  #vehicular_traffic__vehiculartraffic__vehicle_traffic__vehicletraffic  the aggregation of vehicles coming and going in a particular locality
     subtype:  #automobile_traffic__car_traffic__cartraffic  cars coming and going
     subtype:  #bicycle_traffic  bicycles coming and going
     subtype:  #bus_traffic__bustraffic  buses coming and going
     subtype:  #truck_traffic__trucktraffic  trucks coming and going

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