high road vs roadside

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. 

roadside

noun
  • The area on either side of a road. 

adj
  • Located beside a road. 

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