As a former first responder, I can tell you, If you are at a red light, the best thing to do is stay put. Emergency vehicle drivers have to quickly determine what they have to do when approaching a intersection. Sometimes, moving can make matters worse. The one thing to remember is that emergency vehicles ARE NOT above the law. They too must follow all traffic laws as everyone else, they are only to be given right of way when they are using lights and siren, and even then, if they were to be struck by another vehicle while going through the intersection, the laws of who had the "green" or "red" light still applies, meaning if the emergency vehicle had a red light, even while using lights and siren, its driver would get the ticket. It is the responsibility of the emergency vehicle's driver to ensure that all traffic has come to a stop before proceeding.