I did some work during the construction phase at the property of some really rich guy. Most would know him. He had bollards like that installed about 50 yards past the guard house at the end of his driveway. Just before you get on to the bridge leading across the "pond" on the way to his house. Did you notice the cute flashing red lights around the top of them? If you crash the guard house, the bollards shot up out of the driveway, you either stop, crash into the bollards, or swerve and drown after you end up in the pond.

Makes me happy I am not that rich to be worried about such things.