dead-end vs turning circle

dead-end

noun
  • A road with no exit. 

  • A position that offers no hope of progress. 

adj
  • Going nowhere; blocked. 

verb
  • To come to a dead-end. 

turning circle

noun
  • A place where a vehicle can turn and face in the opposite direction. 

  • The path followed by a vessel’s center of gravity when it makes a complete turn of 360° with a consistent rudder angle. (FM 55-501) 

  • The circular path formed by the wheel furthest from the centre of the turn when turning to the maximum extent. 

How often have the words dead-end and turning circle occurred in a corpus of books? (source: Google Ngram Viewer )