Final answer:
When an ambulance with flashing lights is approaching, you should pull over to the side of the road and become stationary, allowing the ambulance to pass safely. Use the Doppler shift of the siren to judge its approach and do not interfere with its path.
Step-by-step explanation:
When you see an ambulance approach with its flashing lights on, you must pull over to the side of the road and stop if necessary, to allow the ambulance to pass safely. It is essential to remain stationary and not interfere with the ambulance's path. The use of the Doppler shift in an ambulance siren helps determine when it's approaching you and when it's passed by.
This information is critical to ensure you take the appropriate action quickly without causing any delays to the emergency vehicle, which may be heading to a nearby accident site or transferring a critical patient to a hospital. If you are driving, it's best to slow down, check for traffic around you, and move to the side of the road, coming to a stop if necessary. For those standing on a sidewalk, ensure you are not obstructing the path and remain alert to the situation.