beltway vs thoroughfare

beltway

noun
  • A freeway that encircles a city. 

thoroughfare

noun
  • A road open at both ends or connecting one area with another; a highway or main street. 

  • An unobstructed waterway allowing passage for ships. 

  • The act of going through; passage; travel, transit. 

  • A passage; a way through. 

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