answer: #Person1# and Betty meet on the underground and they prefer it to other transportations.
documents: #Person1#: Betty, fancy seeing you here. I didn't know you took the underground.
  #Person2#: I don't usually. It's just that I'm fed up with driving and paying so much for gas and the buses are crowded and unreliable, so I thought I'd give this a try.
  #Person1#: I know what you mean. I started taking the subway 2 years ago and it's wonderful. Both my home at her office are within easy reach of the stations. When I was driving, I wasn't getting nearly as much exercise.
  #Person2#: Exactly. Plus the subways cheaper than gas in the long run and the trains leave every 15 minutes. So if I miss one, I don't have to wait long for another.