No not at all Jonney. It was literally in the middle of a ploughed field and didnt seem to be protecting anything at all!. But thinking about it logically the ones I have seen are in a line of sorts so it could be exactly as you say a stop line. Although the shit construction of them would not have stopped an army of jellybabies. I will get close up to them and have a a more detailled look because these new two have got some sort of Blast door on the back.