Apparently more than 4 for this lady:
http://www.bellinghamherald.com/news/local/crime/article35983284.html

-purposely steps into oncoming traffic for the 1st and 2nd shots

-then lays down in traffic for the 3rd shot

- then gets up and walks across the median to get nailed by one more going the opposite way

And 2 of the 4 cars didn't even stop.