Emergency Ambulances

There were not any federal standards for light based ambulance alerts for a very long time. So these things go state by state, and the rules for one ambulance may not apply in the next state over. For instance, in minnesota, you can only use blue lights on a vehicle if it's a snow plough or road m ante a set up. But in illinois, all the medical or fire emergency vehicles have to use blue. And this irritates the heck out of me, that it is still a patchwork, at least in the united states, a state by stateright.