There really isn't. Most of the laws regarding that is "driving with a due regard to safety." You can't just blow through intersections willy-nilly. A lot of progress has been made with driving code 3. A lot of studies have shown it honestly doesn't improve patient outcomes based on the limited time gained. There are exceptions of course.
They still have to follow the rules of the road. In my state legally even running code 3 (lights and sirens) they are only legally allowed to go 5mph over the limit. And if there is an accident the ambulance driver is basically automatically assumed at fault.
It's the time in America at the end of summer when the "back to school" list's come out for each grade of each school.