May not be personal. Many people drive distracted. Since you couldn't see in the windows they may have been looking down at their phone or something. I've had a similar experience. I saw a car heading my way on a narrow street. It kept coming over to my side of the road. When it got closer it appeared to have no driver. I was just about to bail into a drive way when the driver popped up from the passenger side of her car and yanked the vehicle back over. I'm guessing she dropped something on the floor and decided it would be a good idea to look for it while moving down the street.