answer: #Person2# has been driving for 3 hours so #Person1# suggests a switch. #Person2# accepts and tells #Person1# to be careful.
documents: #Person1#: Dad, you've been driving for three hours. Why don't we have a switch?
  #Person2#: There're a lot of chuckholes on this old highway. Driving on it is experience-demanding.
  #Person1#: Trust me. I've been driving for two years.
  #Person2#: Ok. You drive and do be careful.