Parking space lock by police

Good evening to each other !!!! Yesterday evening I drove at 18h30 to the rest facility Am Hockenheim-Ring and wanted to make my legal break , the first 15 parking spaces had been spooked by the police ,on my question whether it was possible there to parking the official laughed at me and thinks I could indeed drive around at the cross Walldorf a round until then it would be 19h and they would then start with their night control and then would certainly be a place for me free . I wonder if there should be checks on a rest area in the evening where everyone is fighting for a parking lot, I then drove on and covered my driving time by 32 minutes thanks to the nice gentlemen of the police