Present Simple or Continuous?

Mary sees Peter standing at the bus stop.

Mary: Hello, Peter. What bus are you waiting for? 

Peter: Hallo, Mary. I'm waiting for a 9 or a 14.

Mary: You usually go by car, don’t you?

Peter: Yes, but the car belongs to my mother and she sometimes wants it.

Mary: I usually go by car too. Jack takes me because he passes my office on his way to  

the factory. But this week he is working in a factory in the opposite direction.

Peter: Here’s a 9 now. Are you coming on it or are you waiting for a 14?

Mary: I think I’ll take the 9. If I wait for a 14 I may be late.