Dude ok.. WHat im saying is, no matter at what speeds you do, you are still likely to hit someone and injury someone or something seriously. What happens if there are conditions where you cant serve right due to narrow roads or something..
I guess it all depends in the conditions you are in.. Something will always come out unexpected.
But yes obviously doin excessive speeds will take longer to stop and be a little more dangerous. But even 60ks stopping to say 20ks and hitting someone will injure them serverly.
I guess it also depends on luck and chance.
So best method is driver awarness..