autobahn vs expressway

autobahn

noun
  • By analogy, any wide, high-speed road. 

  • The high-speed intercity highways of Germany and Austria. 

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 autobahn and expressway occurred in a corpus of books? (source: Google Ngram Viewer )