Okay gang, I need some help. I just drove home on I-66...normal rush hour traffic at 2pm. I'm following another vehicle about a car and a half length back (not really tailgating as it's about the same distance as everyone else, and I can see ahead/over it) at around 30-40mph in the left lane when this Lexus SUV (I forget the model, but it's the larger one...LX430, I think) in the middle lane flips on his signal and merges in front of me with about a foot to spare. Now (then, not now) I'm SERIOUSLY pissed, and tailgating him for the next mile, maintaining about that same distance...and yes, I know it's wrong, and that I shouldn't be playing chicken with a two ton vehicle. So, I'm here confessing my dumbass mistake, and asking for suggestions...how do you guys keep your cool when some dolt pulls a stunt like that with you? I'm still peeved about him, and I wish Officer Friendly had been there to see him cut me off, but I know my action could have cost me too. Feel free to tell me what an idiot I was, but what should I have done...just back off and go on my merry way?