When an emergency vehicle (police car, fire truck, or ambulance) approaches with active acoustic sirens and flashing emergency lights, what must other drivers do?

1. Speed up to stay ahead of the emergency vehicle
2. Immediately yield right-of-way by safely moving to the right side of the roadway and stopping if necessary to clear a corridor
3. Brake abruptly in the center lane and activate hazard lights
4. Follow closely behind the emergency vehicle to navigate through traffic