No generalized answer can be given. This can be different in every state.
No, you must not follow any emergency vehicle closer than 200 ft in Georgia
Yes if you are just following it to see where it is going. It is however not illegal to be going in the same direction as an emergency vehicle as long as you stay 500 feet back. If the emergency vehicle is not using its emergency lights or sirens, and is not stopped at an emergency scene, you can treat it like a regular vehicle and follow it as would be legal for any other vehicle.
500
300
300 feet
500 feet.
300 feet !
It is in California.
3 seconds
Turn on your flashers to help the emergency vehicle. If the emergency vehicle is moving and has a siren running, pull over to the side of the road.
Yes it is against the law to
500 feet