What must a driver do when an emergency vehicle (police, ambulance, fire brigade) approaches emitting audible sirens and flashing blue visual warning lights?

1. Immediately yield right of way by pulling over to the right side of the road and stopping if necessary to clear a free lane
2. Accelerate to clear the road ahead of the emergency vehicle
3. Maintain current speed and lane position because priority only applies at intersections
4. Pull over to the left shoulder and stop immediately