When an emergency vehicle (police, ambulance, fire service) approaches with flashing blue lights and an active acoustic siren, what action must you take?

1. Accelerate to your vehicle's maximum speed to stay ahead of the emergency vehicle
2. Maintain your current lane and speed so the emergency driver can navigate around you
3. Sound your horn to alert pedestrians while continuing ahead of the ambulance
4. Immediately clear the path by moving to the edge of the carriageway and stopping if necessary