I had the same thing happen to me when I lived in Socal...in the 80's I worked for a dealership and some clown broadsided me on the 5 fwy by Disneyland (in the rain, no less...at rush hour)...it was definitely a case of road rage on his part.
He took off after I got his license plate number. Three different people stopped to make sure I was okay...and to offer his plate number in case I didn't get it.
It took 45 minutes for the CHP to show up and take a report. I asked when they were going to "go pick him up" and they said it wasn't a priority as there were no injuries.
After about a week (and constant bitching from my boss at the dealership...because I was driving a company car) I called the CHP to see what they had found out. Nothing...nada...zip...they didn't care.
So....I got in touch with our DMV lady at the dealership and had her run the plates (you could do stuff like that back when). I got the guys name address and all the other pertinient information and went to the Santa Ana CHP office.
When I told the I had all the information as to who the guy was...they were angry...and asked me where I got the info. I bascially told them it was none of their business...and now that they had the info...they needed to go and arrest him...as I would press charges. I would also follow them over to where he lived (two blocks away from Santa Ana DMV).
When we got there he had moved. They issued a bench warrant...but I never heard anything about the case again.
Last thing...about 8 months after the accident I had a neighbor who was an Anaheim detective run the guys name through their system. He hasd quite a few warrants out for his arrest already. He couldn't understand why the CHP didn't pick him up on the outstanding warrants...neither could I...
Glad to hear that you are okay...and that you didn't have any injuries!