Final answer:
When an emergency vehicle with activated lights or sirens is approaching, you must pull over to the right side of the road and stop to let it pass safely.
Step-by-step explanation:
If an emergency vehicle with activated lights and/or sirens is approaching you from behind, the correct action to take is to pull over to the right side of the road and stop. This allows the emergency vehicle to pass by safely and quickly. It is critical not to increase your speed or ignore the vehicle.
Additionally, under no circumstances should you run toward or alongside the ambulance, as these actions would be unsafe and impede the emergency response.