Also don't be stupid with a window open and talk to these people.
Apparently the cop SUV incident got real when they bashed in the back window. Great vid. We need more of these. Blocking roads is an illegal act. You're forcibly restraining somebody from their legal passage and should expect to get run over.
False imprisonment is the unlawful restraint of a person against her will by someone without legal authority or justification. Learn more about this and related topics at FindLaw's Torts and Personal Injuries section.
The idea of personal freedom is closely related to the belief that you can travel where you choose without being restrained by someone else. When someone else restrains you or prevents you from moving, this is punishable as a crime.
I want to get one of those big crowd control sized cans of OC spray to keep in my car. If I were ever surrounded I could put the window down a crack and spray them. If that didn't work they would be looking down the barrel of a gun. At least that way I can show that I attempted to use other means before drawing a gun.
This would be for when you are trapped and can't pull away. One other thing to keep in mind is not to get right up behind the car in front of you at a stop light. This would allow you room to pull away if you needed to.