By slowing down, you are inviting the person to drive around and pass you, whereas continuing on at the speed limit, or speeding up, makes it more of a challenge for the aggressor. Remember, we're not talking about traveling along in the left lane of a highway in this situation.

As far as your fight or flight response from behind the wheel of a moving vehicle, I'm glad you learned your lesson, however, you should always be prepared to defend yourself without having to worry about somebody intimidating you on a roadway.

Like I said, do whatever you feel is needed and the safest response for yourself in the given situation. If you allow yourself to be intimidated by somebody riding your ass, and respond by accepting such intimidation, by all means, go for it.