Final answer:
When an emergency vehicle with its lights and siren on approaches you on a 2 Way Rd., you must stop and become stationary until it has passed. It is unsafe to run toward or alongside the ambulance. Correctly responding to emergency vehicles is crucial for public safety.
Step-by-step explanation:
When you are approached on a 2 Way Rd. by an emergency vehicle with its lights and siren on, whether from the front or rear, the appropriate action is to stop moving and become stationary until it passes by. This is crucial as it ensures the emergency vehicle can proceed to its destination without any obstruction. It is important not to run toward or alongside the ambulance as this can cause confusion and potentially hinder the response time of the emergency services.
In a related scenario, if you're standing on the sidewalk and an ambulance drives by with its siren blaring, the frequency that you observe to match the actual frequency of the siren most closely when it is in front of you. This is an example of the Doppler effect wherein the observed frequency increases as the source approaches and decreases as it moves away.
Understanding and reacting properly to the presence of emergency vehicles is essential for public safety and the well-being of individuals in need of immediate medical attention.