FlashBazbo

This is going to be a very unpopular post.

I don't know your local laws but, in most states, he complied with the law. He stopped to check on you. If there were no injuries and no car damage, he was entitled to leave. End of story. (The child seat thing is a violation, but that's not your deal.) He is fully entitled to protect himself by avoiding a confrontation with an uninjured, "seriously pissed" driver whose car isn't damaged.

On the other hand, giving chase and trying to run a guy off the road? I would drop this thing. If the police really do get involved (which I doubt), you'll be the one paying the larger penalty. In most states, you committed at least one misdemeanor and one low-level felony with a dangerous weapon. (Yes, a car is considered a dangerous weapon at law.) At the end of the day, he won't get ticketed for anything (no witnesses but you to the child seat violation) and you'll end up arrested or with a hefty fine or both.

I'm very glad for you that nobody was injured and there was no damage to your car.

(Did I mention that I figured this wouldn't be a popular post?)