When driving in heavy traffic, what should you do if an ambulance with sirens sounding is trapped directly behind you at a red traffic light?

1. Check traffic carefully, pull forward cautiously to the right edge of the intersection without endangering cross traffic to create a path
2. Stay exactly where you are, since moving off on a red light is always an offence
3. Cross the intersection immediately at speed to clear the whole junction
4. Reverse away from the stop line to open a gap behind you