roadman vs travelling salesman

roadman

noun
  • A man who builds or repairs roads. 

  • A member of a subculture characterised by their clothing (notably puffer jackets and sportswear) as street fashion and the music they listen to, notably drill music. 

travelling salesman

noun
  • A man who travels, often within a certain territory, soliciting orders or selling goods. 

How often have the words roadman and travelling salesman occurred in a corpus of books? (source: Google Ngram Viewer )