In urban areas such as densely populated cities, drones may be used with extreme caution. It is never allowed to fly over assemblies of people, however a C0 (and C1 drone) may be flown over uninvolved people if it cannot be avoided. Before starting the UAS operation, the remote pilot should assess the area and should reasonably expect that no uninvolved person will be overflown.

Suitable C-classes	C0
Subcategory	A1<250g
Maximum altitude	120m AGL or less
Flying over uninvolved people	C0 - should be avoided

Implementing regulation (EU) 2019/947
AMC1 UAS.OPEN.020(1) and (2) UAS operations in subcategory A1

(a) For UAS in class C1, before starting the UAS operation, the remote pilot should assess the area and should reasonably expect that no uninvolved person will be overflown. This evaluation should be made taking into account the configuration of the site of operation (e.g. the existence of roads, streets, pedestrian or bicycle paths), and the possibility to secure the site and the time of the day. In case of an unexpected overflight, the remote pilot should reduce as much as possible the duration of the overflight, for example, by flying the UAS in such a way that the distance between the UA and the uninvolved people increases, or by positioning the UAS over
a place where there are no uninvolved people.

(b) It is accepted that UAS in class C0 or privately built UAS with MTOMs less than 250 g may fly over uninvolved people; however, this should be avoided whenever possible, and where it is unavoidable, extreme caution should be used.