No, no: it's ok! I'll brake so that *you* don't have to!!

Some years ago my O.H. and I joined the M4 at the Welsh end Pont Abraham, there was roadworks in progress and bollards everywhere, the usual thing, they were channelling the traffic to use the one side of the motorway whilst resurfacing the other. We were in a luton van the person in front of us must have panicked at the confusion of the bollards, and tried to get back to the lane we were in, there were bollards flying everywhere, even some thrown under our vehicle, my husband was struggling to control the vehicle, and not tip over, I looked in my side mirror and could see an arctic behind us, he had blocked the motorway, he was stopping anything from passing him and preventing what could have been a serious incident.