it is that the other driver could end up being involved in a motor vehicle accident.
the first thing you need to do is keep your own safety in mind and do everything possible to safely avoid that vehicle. do not follow them if they are ahead of you, and if you are in front them, you may consider slowing down or turning off somewhere, if you can do so safely, to allow them to pass you. attempt to get the vehicle’s license plate number, safely, and then pull over and call 911 with the vehicle’s information and location. police will want to know the make and model of the vehicle 