A few years ago when visiting my cousin living in London, she told me that those type of bollards had been inserted in one of the streets in East Ham, I believe she said to close off the street for special occasions, however a police car happened to pass when they were being demonstrated and got hung up on one. She said it was a real Cock-Up, a favourite term of expression on British and Australian TV News. Doubtful if one would hear that discription on ABC, CBS or NBC in the USA. or even CNN or FOX.