When I'm cruising along at about 5 over and trying to be aware of my surroundings, it's still pretty easy for a vehicle doing 25 to 30 over to sneak up on me unnoticed. That being said,I have only had 1 vehicle with lights and sirens get behind me undetected in the last 25 years. I still don't know where he came from or where he was going,but he wasn't wasting any time getting there.
The chases at times, are probably a necessary evil,and should be avoided if possible. I believe that if the penalty for running is stiff enough, it would reduce the runners.JMHO