answer: #Person1# tells #Person2# #Person1# thinks the way people uses car will change and people will have to rely on trains. #Person1# also thinks there'll be more efficient train systems between cities.
documents: #Person1#: The traffic is becoming worse and worse. I think there'll be huge changes in the ways people use cars. New laws will be made about what kind of car you can own and when you can drive.
  #Person2#: Maybe there'll just be too many of them on the roads. The air will be so seriously polluted that nobody will be able to breathe.
  #Person1#: Exactly. People will have to rely on trains.
  #Person2#: Why do you say that?
  #Person1#: Well, we won't be able to use cars, and airports take up too much space. That leaves trains.
  #Person2#: Huh. So do you think there'll be more efficient train systems between cities?
  #Person1#: Sure. They'll enable people to travel between cities in a matter of hours. There may even be trains going under the oceans to connect the main continents.
  #Person2#: Under the oceans? Oh, no! I get nervous enough flying on a plane.