high road vs main drag

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 drag

noun
  • The main street of a town or suburb, or the principal highway passing through a rural area. 

  • Used other than figuratively or idiomatically: see main, drag. 

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