General vehicle control on private premises

Hello, on the farm of our farmhouse (on the road through the village) the police carried out a traffic control last week from about 20 o’clock. So the patrol cars, lighting vehicles, etc. they have parked on the private premises. The farm is not structurally separated from the public transport space. Since the farmhouse is uninhabited (except a few sheep and chickens) I only got it on the weekend from a buddy. May the police without asking such a control station set up??? Greetings