The same thing happend to me a few years ago. I was riding two abreast with a friend of mine in the right hand lane. We were keeping up with the inner city traffic pretty well and there were three lanes going in our direction. This guy started honking about 100 yards to the rear of us and came up quickly and then laid about 35 feet of skidmarks when he applied his brakes. At the same time I could see him cussing and yelling on the inside of his car and waving his hand telling us to get out of his way. I stopped my bike in the middle of the lane and got off and it was at about that time that he noticed my gun, badge, and full bike patrol uniform. My how his manner changed. He was all apologetic and sorry and said he wouldn't have done that if he knew I was a cop. I politely explained to him the rules of the road and that cyclist have a right to be there just like him and that he shouldn't do that to anyone. Needless to say he didn't have too much to say when i gave him some traffic tickets to ponder over.