autoroute vs expressway

autoroute

noun
  • An expressway, freeway, motorway or highway. 

  • An expressway in any Francophone country. 

expressway

noun
  • A road built to freeway standards. 

  • A divided highway, especially one whose intersections and direct access to adjacent properties have been eliminated. 

  • A road built for high speed traffic, but not up to motorway standards or designated a motorway. 

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