I'd like to make this comment:
I don't know if all jurisdictions use the same light bars for their patrol vehicles, but here in Nebraska, both the state and the local law enforcement vehicles are equipped with lights which are brighter than the midday sun! My eyes are very sensitive to bright lights at night and I find that the lights they display to the rear of their vehicles are excessively bright and extremely disorientating.
Most of the Nebraska roads that I drive on have absolutely no road lighting, so it is very dark except for the lights of other vehicles. When I come up on a patrol officer at a traffic stop, I am nearly blinded by their rear facing lights. I wish they would make it mandatory that all patrol vehicles utilize a dimmer version and only yellow/orange lights to the rear instead of the pulsating 100,000,000 candle power red, white and blue signals. These are so doggone bright to me that I MUST slow down to a crawl just to discover where the heck the patrol car is on the road. I don't find this safe at all.
I know they have the options, I wish they would all use them. I also think that it would be best of they had yellow or orange lights to the rear that blinked in a pattern to show the traffic approaching from their rear which direction to pass. Most generally this would be on the left, but if there is an accident in the median and the patrol car is on the left lane/shoulder of a multi-lane expressway or something, the
light bar giving the indication to move to the right would be much more safe than just a bunch of random flashing and blinding lights.
RADAR