I hope so, but I think that could depend on how "dramatic" the circumstances were.It most definitely was witnessed. ?
A scenario featuring attention grabbing swerving, acceleration and braking, and the perpetrator posturing or actually attempting to aim the weapon out the window while driving would get witnessed in the true sense of the word.
But.... a scenario featuring a single merge, a swerve, followed by the perpetrator driving past and firing one shot into the trunk with out posturing and with out extended arm aiming etc. would not draw alot of attention.
I am thinking that the second scenario is more likely. The perpetrator shot into the side of the trunk area while driving by. This could support that the perpetrator was not fully trying to kill an occupant. Rather, he was going to shoot into the side of trunk as a warning. He may not have seen the car seat, then misjudged the angle.
This, would, of course makes no difference in regards to punishment. The more severe, the better.