Mind for Shooting
As the main task of the BVG lies in the transport of passengers, the normal operation of the buses must not be hindered. Film shoots, which reduce the safety for the driver and the passengers, cannot be permitted.
For shooting on public streets you need also a permit of Berlin authorities - see Filming on Public Streets and Roads.
Projects, which are detrimental to the image of the BVG, cannot be permitted.
During public events shooting is usually not permitted, due to the expected amount of passengers.