#junction  the place where two or more things come together
  supertype:  #topographic_point__topographicpoint__place__spot  a point located with respect to surface features of some region; "this is a nice place for a picnic"
  subtype:  #interchange  a junction of highways on different levels that permits traffic to move from one to another without crossing traffic streams
     subtype:  #cloverleaf  an interchange that does not require left-hand turns
  subtype:  #crossroad__intersection__crossway__crossing__carrefour  a junction where one street or road crosses another
     subtype:  #street_corner__corner__turning_point__turningpoint  the intersection of two streets; "standing on the corner watching all the girls go by"
        subtype:  #blind_corner__blindcorner  a street corner that you cannot see around as you are driving
     subtype:  #level_crossing__levelcrossing__grade_crossing__gradecrossing  intersection of a railway and a road on the same level; barriers close road when trains pass
  subtype:  #p-n_junction__pnjunction  the junction between a p-type semiconductor and an n-type semiconductor; "a p-n junction has marked rectifying characteristics"
  subtype:  #railway_junction__railwayjunction  a junction where two or more railway lines meet or cross
  subtype:  #T-junction  a junction where two roads or pipes etc. meet to form a T
  subtype:  #traffic_circle__trafficcircle__circle__rotary__roundabout  a road junction at which traffic streams circularly around a central island; "the accident blocked all traffic at the rotary"

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