I was a witness once and it really helped the guy out. Guy was in front of me and the light changed. It took him another second or so to go and bam, guy running the light from the right takes off his bumper.
They pulled into a gas station and I had to go around the block to get back.
I pull in and the guy in front of me is all happy to see me because the light runner is saying the guy in front of me ran the light.
Gave him my contact info, but never got a call. I’m assuming that once the light runner was confronted with a witness, he had to take responsibility.
I’ve thought about this a lot lately and have been thinking about getting a cheap dash cam that mounts on the rear view mirror or something to act as a witness in a case like this.