In a method for determining the spatial extent of a free-forming queue, on the basis of position information, a monitoring area that comprises the free-forming queue is first of all divided into a plurality of positions. On the basis of the position information, objects that are associated with the free-forming queue are recognised and tracked. Periodic storage operations of a current position of at least some of the tracked objects are performed. An average speed of at least some of the objects is detected, the average speed of an object being determined on the basis of a plurality of the stored positions of the respective object. Finally, a first map is produced that records a density of occurrence of objects at the relevant positions in relation to the positions in the monitoring area. For this, objects with an average speed outside a predetermined range are not taken into account when producing the first map. Based on of a predetermined starting area for the free-forming queue, a floodfill method is performed to produce a contiguous area that corresponds to the extent of the free-forming queue. For a validity check, the first map is used.
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