I don´t know why I haven´t seen this before, I love it. A red DB bus ist just what my german city was missing!
Although I would have one request, could you make a second version without the lettering "Rhein-Nahe-Bus" (there are 3 or 4 places where this appears on the bus)?
It´s because this narrows down the use possibility too much to a city located in the Rhein area.