What is the mandatory procedure when an emergency vehicle (police, ambulance, fire engine) approaches with active sirens and flashing blue/red lights?

1. Immediately clear the way by pulling over to the right side of the road and stopping if necessary to allow safe passage
2. Accelerate rapidly to stay ahead of the emergency vehicle
3. Continue at normal speed in the same lane because emergency vehicles can overtake anywhere
4. Stop immediately in the middle of whatever lane the driver currently occupies