metro vs right of way

metro

noun
  • A rapid transit rail transport system, or a train in such systems, generally underground and serving a metropolitan area. 

  • An urban rapid transit rail transport system, normally with lighter track and light trains (i.e. an S-Bahn or similar), or a train in such systems. 

  • A metropolitan area. 

adj
  • metropolitan 

right of way

noun
  • The area modified for passage of a railway; often specifically the railbed and tracks. 

  • A legal easement granted for the construction of a roadway, railway, power line, or other utilities. 

  • A legal right of passage over another's land or pathways. 

  • The right to proceed first in traffic, on land, on water or in the air. Also in metaphorical senses. 

  • Land on which a right of way exists. 

  • The priority granted to the first person to properly execute an attack. 

How often have the words metro and right of way occurred in a corpus of books? (source: Google Ngram Viewer )