boulevard vs hard shoulder

boulevard

noun
  • The landscaping on the sides of a boulevard or other thoroughfare. 

  • A broad, well-paved and landscaped thoroughfare. 

  • A strip of land between a street and sidewalk. 

hard shoulder

noun
  • A verge to the side of a highway, which should be used only in case of an emergency (especially on a motorway) 

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