"Which bus is Peter travelling on?"

Translation: Melyik buszon utazik Péter?

[JanTatouse]

If you are asking about a specific bus number, what would be the most common way to say it? Can you say "Hányas buszon utazik Péter?" Because I think that in Hungary bus lines are referred to as e.g. négyes busz, ötös busz, etc.

[96314081311257]

Yes! Very good intuition! :)