pull over vs shut down

pull over

verb
  • To come to a stop, and turn off the road (i.e. onto the roadside or hard shoulder). 

  • To command or force someone to drive their vehicle to the side of the road or curb and come to a stop. 

shut down

verb
  • To turn off or stop. 

  • To pass (another vehicle), especially quickly. 

  • To close, terminate, or end. 

  • To emotionally withdraw into oneself as a defense mechanism; to block out external stressors. 

How often have the words pull over and shut down occurred in a corpus of books? (source: Google Ngram Viewer )