I am not sure why there needs to be a new law. If one isn’t cautious enough and causes a death, its manslaughter at least.
If one purposefully and willingly plowed into or drove over a crowd, it would be murder.
If it is a situation where one is in danger and had to accelerate away, hitting someone, then one would have committed justifiable homicide. (If you don’t think this could ever be justifiable, imagine the Nazis from Charlottesville threatening to rip someone out of a car and killing them.)
It seems to me the current laws cover the possible scenarios. I guess the one other scenario is if someone laid down in front and in back of your car and you couldn’t move, yet weren’t in imminent danger, and you slowly drove over them? As much as I would disagree with such a tactic, I can’t condone it reasonable to proceed.