Everyone else has played the "Dial 911" card, so I'll shift gears.
In my opinion, it is not a wise choice to stop the car, period.
There is too much risk that someone can pile out of the vehicle, approach the car, and then break the window before you can even react. First chance you have to react might be a club or knife in your face. Looking at risk:reward, there is too much downside for negligible upside when stopping the car.