(All along Interstate 30 in Winfield and Titus County) –Midnight, January 11th,2009 At least 3 marked cars, one of which was labeled Sheriff, were hidden along Interstate 30 in the area of Winfield with lights off. I was cruising with control set at the speed limit. Was ticketed for seven miles over limit. I have owned this auto for 10 years and know that it reads about two miles higher than actual speed, I believe he actually wrote me 9 miles/hour greater than I was going. The interesting part is that I saw him at least 1/4 mile ahead crossing median toward me. Not to get me, but to take off like his foot was stuck to the floor. I thought he was after traffic further west. He suddenly stopped, crossed the median again, and parked under an underpass pointed east. As I passed, he tore out from under the underpass and crossed the median again. This time to chase behind me. I looked like I could pay!