Sometimes emergency vehicles need the ability to affect traffic lights. I'm pretty sure I've seen this happen once (in NL), at an intersection with a very pred

Sometimes emergency vehicles need the ability to affect traffic lights. I'm pretty sure I've seen this happen once (in NL), at an intersection with a very predictable traffic light sequence (some intersections use sensors, others simply follow a set pattern), an ambulance came by, sirens blaring, and the whole pattern pretty much skipped a "turn".