I remembered this after something
astrojetta posted today:
Saturday after leaving Alan's disasterous doctor appointment - I was looking up the block to make a left turn when I saw a dark blue car go flying and heard a crash. I made my turn, pulled over to park and went up the street to see what happened bringing my cell phone. (Mark and Alan were in the car). A car had pulled out of a driveway into a second car on the street which went into a parked car on the other side of the street. I called 911 and stayed until I could see that everyone was ok (they were, but I suspect the dark blue car is totalled as the front wheel was bent badly) and that I could give my name as a witness. I felt it was the right thing to do.
I had a similar thing happen 20 (!) years ago when I lived in Massachusetts. I had put my stuff on the trunk of my car after leaving a convience store was rummaging through my purse for my key when I saw a car accident. The details are fuzzy now but it involved someone entering or leaving a parking lot and someone on the street. And I remember someone was shook up or out of it. I stayed until the police came and I was called or contacted by at least one insurance company about it.
It's definitely the right thing to do. And fortunately insurance companies can't charge or blame you for it!