I've done the "taking a picture with a cell phone" thing - using a cell phone that doesn't even have a camera -- and it worked. I'm sure it's not guaranteed to work every time, and not in every situation, but I'd do it again. This time, I'd do it with the cell phone with a camera. Some people sure are brave inside their big ol' cars. They think you can't catch them and if you could, you can't prove they did anything. Arghhh.

Glad you're o.k. I know it's unnerving.