I vote to restrain youself when possible.

I'm basically a very sweet guy. But I have a weakness: road rage. If someone buzzes me when I'm on my bike, for some reason I really want to chase them and set them straight in no uncertain terms. I really have to work at not letting it spoil my ride.

It's better to err on the side of self-restraint. That way, you won't do anything you'll regret later.

But if I can call in their tag to someone who cares, I certainly will (if I get a chance to read it.) I did that with a transit authority courier vehicle who was harrassing me regularly. I called and reported it, but they couldn't do anything without the tag. When I finally got the tag number, they pulled the driver into the office and had a little chat.

That driver never bothered me again, and even drove the speed limit and I saw him several times after they corrected him.

But it helps to know the laws in your state. In my state, there's a fairly new law against "aggressive driving," which covers a lot of bad driving behavior. When I reported someone to the county police for harrassing me, the officer responded by saying, "But people do that kind of thing all the time." He didn't know that driver was violating the new law.