traversal vs zebra crossing

traversal

noun
  • The act of traversing; a crossing 

  • The act of following a path or route. 

  • The product or result of traversing. 

zebra crossing

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

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