JenCh012, how do usually bus-drivers react in Europe if they notice you taking photos of the bus? In Finland bus-drivers were quite friendly, though.

It depends on the driver and the mentality of the specific country. In Luxembourg, the reactions are always different. Most of time they doesn't really react, but if they react its mostly friendly. In France I often had drivers waved to the camera. In Belgium, I have never had a reaction of a driver. In Germany, when I was in Trier, I had two negative reactions in one day by drivers (!) but I think this is rare.