In some inner city areas, residents' parking zones have been set up (by means of traffic signs) due to a considerable shortage of parking space. To be allowed to park in these areas, you need a resident parking permit.

Resident parking permits are issued on application.
Anyone who is registered in the area with a resident parking permit (main residence) and actually lives there is entitled to a permit. Depending on local circumstances, the registered secondary residence may be sufficient.
Each resident receives only one resident parking permit for one vehicle registered to him/her or which he/she verifiably uses on a permanent basis.