The central road traffic authority of Berlin issues an exception according to Section 46 (2) of the Road Traffic Regulations.
Flashing light driving is generally only permitted in cordoned off areas.
For application please use this application form (in German language only).
Flashing light driving in a restricted area does not require a separate permit. If the flashing of blue lights takes place in flow traffic, a permit must be obtained from the responsible lower road traffic authority of the district of the filming location.