I recently observed a neighboring county patrol car on the highway doing similar things. Mainly not using signals to change lanes, and tailgating, you know how some just have to clear that left lane no matter how fast the car ahead of them is going. That intimidates some drivers, makes em nervous, maybe its a tactic to shake out criminals by doing just that. Its common enough that it sticks out in my memory, see them using phones with no hands free device, also see a lot of commercial drivers using phones like that too. Was driving next to an idiot texting on a nearby busy highway, head down, I don't like these kinds of drivers, they get people killed.
About 10 years ago, I was asked to go pick up a tractor trailer at a farm, and take it 2 exits or so down to fuel it up. While doing that a state trooper was in the vicinity, he overtook me from the middle lane, and literally pulled out in front of me, had I been loaded, I would have pushed the trunk of that car into the back seat, something I have actually done when someone did that same thing, some ford escort variant, scary stuff, especially being on a high bridge ! Unloaded they skid, loaded they just don't stop quick, what this inexperienced state trooper did, I was in disbelief, all to pull someone over, had he turned his lights on in the middle lane first, I'd have slowed, but he cut right in, no lights, or turn signal, then turned on the flashing lights, with no regard to what was behind him. I was like of all the dumb luck, don't drive commercial much, it was just like in the old days, I'd always be the guy who got pulled over, 2 trucks or 40 running locally, same trooper, 3 different companies, just happens to be me every time. I cannot even imagine what would have happened, things do get turned around sometimes, had a trucker out of canada rear end me, me 55 mph, he, 60+ mph, I was in a R model long frame mack, 48' flatbed, he hits me and rips the nose of his tractor, I somehow left short skid marks, impact made me hit the brake pedal, I got cited for unsafe braking, so with that in mind I was so glad I was able to avoid the collision, clean abstract 25 yrs, just knew it'd get turned around and I'm at fault,when in fact it was clearly the opposite.