chevron vs hard shoulder

chevron

noun
  • One of the V-shaped markings on the surface of roads used to indicate minimum distances between vehicles. 

  • A V-shaped pattern; used in architecture, and as an insignia of military or police rank, on the sleeve. 

  • An angle bracket, either used as a typographic or a scientific symbol. 

  • A wide inverted V placed on a shield. 

  • A háček, a diacritical mark that may resemble an inverted circumflex. 

  • A guillemet, either of the punctuation marks “«” or “»”, used in several languages to indicate passages of speech. Similar to typical quotation marks used in the English language such as ““” and “””. 

verb
  • To form or be formed into chevrons 

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 chevron and hard shoulder occurred in a corpus of books? (source: Google Ngram Viewer )