In all states I'm familiar with, the driver with the green light is still supposed to yield the right of way to the emergency vehicle once they see it. The amb

In all states I'm familiar with, the driver with the green light is still supposed to yield the right of way to the emergency vehicle once they see it. The ambulance driver has a responsibility to make sure that the driver with the green light is doing so. If a car is e.g. going 55 through a green light, they might not even hear the sirens until it is too late to stop. The US, in general, doesn't have strict "right of way" rules for it's always X driver's fault. All parties involved have a duty to avoid an accident. If you see someone doing something totally stupid and against the rules of the road and just plow into them, it's technically your fault (of course they would have to prove that you deliberately failed to avoid the collision, so if you keep your mouth shut, you might get away with it[1]). 1: Not legal advice!