A control barrier is provided having a barrier wall with one or two support assemblies attached thereto. The imaging unit includes a plurality of diagnostic radiation sources, from which diagnostic X-ray radiation are directed onto an object to be examined, and a diagnostic radiation detector, with which the diagnostic X-ray radiation is detected after passing through the object to be examined. The query subsystem accesses an inference model to infer a probability distribution over a user’s goals, age, and preferred level of detail of an answer. The pin has an optical fiber provided therein. From the current position of the motor vehicle and the geographical data of the data set selected, further data are generated and shown on the display.