Final answer:
The minimum distance permissible for any person other than an authorized emergency vehicle to follow a fire apparatus responding to an emergency or to follow an ambulance when its flashing red lights are operating is approximately 500 feet or 3 city blocks.
Step-by-step explanation:
The minimum distance permissible for any person other than an authorized emergency vehicle to follow a fire apparatus responding to an emergency or to follow an ambulance when its flashing red lights are operating may vary depending on local laws and regulations. However, a common rule of thumb is to maintain a distance of at least 500 feet or 3 city blocks behind the emergency vehicle or ambulance.
This distance ensures that there is enough space for the emergency vehicle to maneuver safely and that other drivers have enough time to react to any sudden changes in the situation.
It's important to always stay alert and maintain a safe distance to avoid hindering the progress of emergency vehicles or endangering yourself and others on the road.