Middle finger doesn't help this situation, however much you feel inclined to use it. It would quite possibly work against you because the police could see it as a form of aggression/abuse/intimidation. You have to take the moral high ground.
I have also experienced the intimidating driving of this Co-Op lorry driver tonight on Newark bypass.
He tried to cut me up and then because I didn’t let him he booted me, flashed his lights and then came right up my bumper when I kept to the speed limit. Very scary as I didn’t know what he was going to do next. Why do Coop employ such a crazy scary driver?
Middle finger doesn't help this situation, however much you feel inclined to use it. It would quite possibly work against you because the police could see it as a form of aggression/abuse/intimidation. You have to take the moral high ground.