In response to the questions and responses about representing yourself, don't do it, you will lose. Like I said above, the chances of you having to go to court are slim anyway, but if you did, your testimony is not going to stand up very well against the accident reconstruction expert the plaintiff brings in. If you feel the need to do so, get a written statement from the witness stating his name, residence, SS#, how the accident happened, where he was standing in relation to the cars, weather conditions, visual obstructions if any, the color of any applicable lights for both vehicles, approximate speed, his distance from the impact, where the cars came to rest after the impact, etc. Have him draw a diagram if possible. Then have it notarized so that when the time of trial comes(if it ever would) he can't come in and say something different.