egress vs escape route

egress

noun
  • An exit or way out. 

  • The process of exiting or leaving. 

  • The end of the transit of a celestial body through the disk of an apparently larger one. 

verb
  • To exit or leave; to go or come out. 

escape route

noun
  • A way out of a difficult or unpleasant situation. 

  • A path used by someone to escape from a dangerous place. 

How often have the words egress and escape route occurred in a corpus of books? (source: Google Ngram Viewer )