Under Article 53 of the Road Traffic Safety Law, what must a motorcycle rider do when an emergency vehicle (police car, fire engine, ambulance, rescue vehicle) is executing an emergency mission with sirens and flashing lights active?

1. Yield the right of way immediately by pulling to the side or decelerating (主动避让)
2. Accelerate to race ahead of the emergency vehicle
3. Maintain speed and lane without making any changes
4. Sound the horn to alert vehicles in front of the emergency vehicle