I'm glad to hear your daughter will make a full recovery. Anything less has bad consequences in life that we don't realize.
If you got within 5 car lengths, I'm curious; did you get his license plate number? If not, there's nothing you can do, and that is the irksome thing.
What worries me is the idea that they could hurt me with something thrown out the window, like a rock or brick, and get away with it. Garbage and beverages are annoying, but not threatening in the end.