high road vs main road

high road

noun
  • A main road or highway. 

  • Used other than figuratively or idiomatically: see high, road. 

  • A course of action which is dignified, honourable, or respectable. 

main road

noun
  • A major road in a town or village, or in a country area. 

  • priority road; A road with entering traffic which must yield right of way 

  • High Street; Main Street 

  • A major urban road, off which lead many smaller streets, many of them cul-de-sacs. 

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