That's about twice the stopping distance for a wet road so plenty of time to stop except that you can't tell until a lot later that someone might be about to cross because you can't see the pedestrian approach. I come from Swindon and drive that road quite often when I go back to visit family and I have never seen a pedestrian cross it. I certainly wouldn't like to do it except on a bright clear and dry day but I dare say that the locals might have a better idea of the risks.