high road vs roadway

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. 

roadway

noun
  • The main or central portion of a road, used by the vehicles. 

  • A way used as a road. 

  • The portion of a bridge or railway used by traffic. 

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