Treo
Bullet Proof
In the age of cell phones it would have been really easy for the guy who was following you to screw you over. Even though he was the agressor he could have called the police and told them that "some guy pulled along side and waived a revolver at me", and then tailed you to give them your location. You can guess the rest - his word against yours but you have the revolver in your car just he said you would.....
Way, way pre cell phones.
A LEO that I know told me to never flash the weapon as a warning in a road-rage situation for this very reason. In addition to the short term headaches it could cause you, most DAs and judges do not regard somebody screaming at you while still inside their car as enough of a threat for you to legally brandish a firearm.
The whole thing happened when I was young and dumb and I would have been screwed anyway because I was carrying illegally.