My last true road rage incident turned out to be with an off duty gang unit cop in my city. He cut me off egregiously, I did the whole flashing lights/horn honking/yelling deal after catching up to him. He just smiled and made a motion at me to pull over. The guy had rims on his car and the shaved head/street dude look, so I'm thinking he's just confident about being able to fight.
When I pulled over, I realized immediately when I stepped to him that the vibe was all wrong. He was totally relaxed and not at all concerned about me. Not that I'm the most intimidating figure in the world or anything, but at the very least he should have been a little more keyed up for a confrontation like I was. I guessed that he either had a weapon be was ready to use or was a cop, so I immediately started deescalating and made sure not to say anything to provoke him.
After a few minutes of back and forth, I knew he was definitely a cop and was trying to bait me into threatening him so he could arrest me. I just kept saying things about how I pulled over to talk it out because he looked like a nice guy. Then he realizes I'm not going to say anything incriminating and comes clean that he was in fact a cop. We ended up talking about the gyms we train at, shaking hands, and going our separate ways. That was probably over 3 years ago now and I haven't road raged since. Just some really stupid shit for a grown man to be doing. I try to smile at people who get mad at me on the road now and go on about my day.