Block the roads I'm driving on and I MIGHT slow down to make sure I hit your dumb-ass center mass. Then again, I might just speed up. If you want to stand in the middle of the road, then you deserve whatever happens to you. Person vs. vehicle is always a 1-sided fight where the person always loses...ALWAYS.
I'm all for protesting, as long as it'd done legally. But trying to block traffic (whether it's vehicle or people), setting stuff on fire, throwing things at other people and/or cars, or other violent behavior is NOT protesting. That's called rioting. And that's against the law.