It all depends...

Have you seen this "which way is the bus travelling?" puzzle?  The point is, that you are shown a picture of a bus, and the side at which you are looking has no door - it therefore follows that you are looking at the driver's side.  So in this country, that would be the right-hand side, and so the bus is travelling to the right.  But of course, we are in the minority - most countries drive on the right and so the driver sits on the left, and the bus would be travelling left.  So without further information, there is no correct answer.