In cities and densely populated areas: any property at least 150m high, outside of it from 100m high. In individual cases from 20m above ground. Special requirements also apply in aerodrome areas ( building protection area ) and at heliports.

In general: The highest points must be fired and the contour of an object or object ensemble should be recognizable. In a high-rise building, these are the corner points and the ridge, for example. If the highest point exceeds surrounding objects by more than 45m, additional lighting levels must be added (e.g. telecommunication towers). The obstacle lights may not be more than 45m apart and must be visible from all sides. If this is not possible, remedial measures must be taken so that the contour of the object can be captured.

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