The cops used to run nothing but C/O and never turn it off. I could be going 120 and be at the PSL by the time I got to the cop.
Now they have all gone to I/O and I get no warning until I am right on them.
Following a speeding car does not work, I drive an old cop car and people will follow me, but they will not speed in front of me.
Every time I drive I end up the leader of a pack a speeders, which I see as a sure way to get caught.