if you hit someone at 60 or 70,theyre still gonna die,speed doesnt kill in its own right,its the application ,as it IS possible to lose control within the speed limit if the conditios are wrong.
seen a few people dead unfortunately,one when the coach i was going to lemans in hit someone at a set of traffic lights (the pedestrian just walked out in front of the bus which was doing a MAX of 15-20mph so speed was immaterial!)she ended up underneath the rear wheels because she thought,like a lot of people in london or other big areas(in my experience!) that if she simply stepped out and didnt acknowledge the traffic she would be fine and traffic would stop,she was wrong.
i hope no one has to see someone die like i did in the gulf tho,thats NOT nice(or car related,and i dont really want to go into it)