<human>: Can you provide a brief overview of the text?

Yesterday I was involved in a bit of a road rage spat on the highway. Someone was tailgating me and wouldn't get off my tail even though I brake checked them quite a few times. They finally zoomed around me and made some gesture (I couldn't quite see it, I assumed it wasn't a nice one) so me, being young and stupid, decided it would be a good idea to give him the finger. He then cuts me off and slams on his breaks, almost causing an accident, so I slam on my breaks and move over a lane and start going back up to my preferred speed, hoping to just get away from this douche. As I am next to him, he throws his van over into my lane. Luckily I saw it out of the corner of my eye and have good reflexes and was able to avoid him, but I had to go completely off the highway in order to not get hit.

I got his license plate number and the name and number of his construction company off the van, unfortunately the number goes to his cell phone. I called and tried to talk to him calmly and politely, as I realized I was most likely dealing with a lunatic and told him he almost just killed me and my girlfriend and he said "I think it's an appropriate response for a couple idiots flicking me off." Is there any legal action I can take? This guy almost killed us, we were going 70-75mph and I barely avoided the accident.
<bot>: Some douche almost killed me and my girlfriend. I got his license plate number and telephone number but there is no visible damage to my car. What can I do?