I have rear sensors on the car, but still reversed into a bollard!
To be fair to the car, it gave me plenty of warning but I thought I knew better. I was looking over my shoulder, could see what I thought was the approaching bollard and considered I still had plenty of room to move back.
Problem was, I was looking at the wrong bollard and the one I hit was out of sight.
As they say, it's the nut behind the wheel.