A friend of mine has used his when a guy just about ran him off the road on the express way. People move over without looking. That is a 3000 lb weapon. Also I have had a dog come out and had to stop the bike.... Bad situation anyways I was told by an officer that I had the right to use it then... I didn't but I almost did.
I don't think I'd use deadly force in that situation. I can hear the prosecutor now...
"How much time does it take to decelerate, take evasive action, and apply your brakes?
How much time did it take you to draw your pistol, aim and kill the other driver?
You're being "run" off the road. Yet you could maintain control enough to draw, shoot, and kill another driver?"
Personally, every time that I have been run off the road, I've taken evasive action to avoid the collision. I have never been in a situation where I would've killed another driver, instead of doing so.