hard shoulder vs turnout

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) 

turnout

noun
  • A place to pull off a road. 

  • That which is prominently brought forward or exhibited; hence, an equipage. 

  • A place where moveable rails allow a train to switch tracks; a set of points. 

  • Net quantity of produce yielded. 

  • The number or proportion of people who attend or participate in an event (especially an election) or are present at a venue. 

  • The act of putting out to pasture. 

  • The act of coming forth. 

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