When you encounter an emergency vehicle on the road that is responding to a call, you're supposed to give the vehicle as much room as necessary to let the driver get where he or she needs to go without issue as quickly as possible. That means pulling over, letting them get ahead of you, and giving them all the room they could potentially need. Which is not what this black sedan's driver did.
As you can see in this video, uploaded to YouTube last week, the driver whose point of view we see pulled onto the right shoulder as the ambulance came up behind the car. That's what you're supposed to do when an emergency vehicle with lights and sirens blaring comes up behind. But the driver of a Nissan Maxima that was sharing the road was not as courteous. The Maxima driver tailed the ambulance until the driver of the emergency medical vehicle decided that enough was enough.
Not only was the driver following the ambulance on the shoulder-a no-no in itself-he or she was also tailgating the vehicle. And apparently, that motorist wasn't the only one, because in the video we see a lifted Ford F-150 come right up behind it once the ambulance comes to a stop.
In New York, law states that you have to keep 200 feet back from fire trucks responding to emergencies. That's a good rule of thumb for all emergency vehicles.