At the risk of being a massive hypocrite, that's a terrible idea ^^. I can relate to idiots making you insanely angry, I've had several extreme road rage incidents that I'm probably lucky not to be in prison for.
The problem with raging against random people (particularly here in Texas, but anywhere in the US really), is you don't know if the guy is carrying and itching to use his CC, or is an off-duty cop who will destroy your world, or whatever. Another thing to consider is that really hurting/injuring someone may end up hurting their family members/loved ones who might be the sweetest people in the world. Sending them home with a broken clavicle, shattered orbital bone, severe concussion, punctured lung, subdural hematoma, etc, is very easy to do in a moment of anger, but on balance is like I said, a terrible idea.
I do admit hypocrisy here, as sometimes I do fly off the handle.