Seems that the popularity of LED lights and better strobes has caused a revolution in light bars on emergency vehicles. It seems that law enforcement officers (LEOs) do a great job of only running their light bars when they need them on. But I've noticed more and more tow truck drivers just leave them on whenever they have a vehicle in tow. Why? They really only need them on while on the side of the road, IMHO. Past that, there is no emergency nor safety issue. They all seem to be able to keep up with traffic fine (in many cases they are passing traffic). I can think of no good reason for the lights to be on. In the dark they are so bright they can be incredibly obnoxious.
Write you state government. We need controls in place. It's light pollution, dangit! Okay, so it's not that big of a deal. But it does bug me.