boulevard vs zebra crossing

boulevard

noun
  • A strip of land between a street and sidewalk. 

  • A broad, well-paved and landscaped thoroughfare. 

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

zebra crossing

noun
  • A pedestrian crossing featuring broad white stripes painted parallel to the street. 

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