An emergency vehicle approaches with an operational blue flashing beacon and special audible siren. What must other drivers on the road do?

1. Accelerate to stay ahead of the emergency vehicle.
2. Yield right of way and, if necessary, clear the lane or pull over to ensure unobstructed passage for the emergency vehicle and any vehicles it escorts.
3. Continue driving normally since the siren is only advisory.
4. Stop immediately in the middle of their current lane.