Well the story changed a bit.
First the driver cut off the OP. Then he stopped at a red light so apparently he wasn't driving so fast
Now he was driving recklessly in and out of lanes. Still managed the red light.
Sounds like the OP was cut off and that's that.
To pull up next to him and take a picture? Of him sitting at a red light??
No, I would not report him.
As others stated how many times have we been cut off, slammed on brakes, etc
I don't know any drivers story. What he/she is thinking, responding to, whatever.
Driving up on a curb, passing a stopped school bus with flashing red lights, causing an accident while not stopping etc. are one thing.
Being cut off is not.
"" Compassion is a verb."-Thich Nhat Hanh