Discription of Events: Driver behind us was tailgating us and did not slow or stop for an emergency vehicle behind us as we did when we pulled over to the side of the road. She finally pulled over in front of us then when the emergency vehicle passed, she stopped the car in the middle of the lanes (partway into the opposing lane), got out of the car and came towards our car in a threatening manner and screaming, shouting obscenities and calling us foul names. She screamed about how we pulled over too quickly (when she was tailgating and not responding to the ambulance). We were quiet and did not say anything but she kept screaming and seemed unhinged, talking about how she had stitches and could barely drive, coming towards us threateningly. She finally drove off and we followed at a distance for a short time, then she pulled to the side of the road where we turned off onto our road. We could tell she was following us and dangerous so we pulled into someones driveway and sat there so she couldnt see where we live and she drove up, stopped her car in the middle of the road again in both opposing lanes and took/pretended to take a picture of our license place number again while screaming. She then finally drove off. She didnt respond to road conditions, stopped in the middle of two busy roads in opposing lanes and screamed in an unhinged way full of obscenity.