"...a certain % of State/Highway Police Officers are killed while handing out citations on the side of the road when they are struck by vehicles..."
I have no idea that the % is, but it will be high. Much more dangerous than bullets and knives.
For traffic control, years ago a guy I worked with had a girlfriend who worked at a plastic factory, she got him sheets of a light blue plastic. He would cut out replacement lenses for our flashlights, that blue worked great at night. Drivers see lots of white, red, and amber lights, the blue just jumped out and grabbed their attention...
Here in Alberta all the cop cars use blue flashing lights. It is against the law for anybody else to have them
I think that is the standard in a lot of places now.
Yes blue stands out very well.
It is also the easiest to see in fog, snow or rain.
Our RCMP want you to pull as far off the road as you can, then they try to keep their car at least partly on the pavement, this is to shield them from traffic a bit as they do their job.
Officers still get run over and killed.