Wow, serious stuff uh. I always wondered, whether these moving patrol cars on the highways are actually setting traps for us to fall in, tracking our speed, or simply just getting from point A to B.
I have encountered numerous times, patrol cars travelling at about 90km/h on the slow lanes, and when they spot BMW's or Merc's, immidiately speed up to about 130~140 km/h, just to see if those cars would dare pass the 110km/h speed.
With your story now, i guess they are monitoring speeds while moving too..