I know it's trivial but I'm curious because I tend to notice very trivial things. But I can't help but notice that over the last 2-3 years or so a lot of NJ police departments who used to have just red lights on their vehicles now have both red and blue. And they just seem to replace a bunch of them at random. Is there something to this, some mandate or guideline, or is it just a coincidence? And I also notice that a lot of the new ambulances and fire apparatus are going to both blue and red too. Strange.