System integrators are employing 2D and 3D LiDAR sensors from SICK to identify vacant truck parking spaces. The sensors are located on masts and moved during operation in such a way as to produce a gap-free 3D image of the car park. This enables regular and irregular packing spaces to be monitored and even checked for accessibility. Data protection requirements are fulfilled automatically. An optimal utilization of parking spaces can thereby be achieved without manual comparisons.