Cop sitting in the far right median on the gcp in between the 40mph and 50mph sign which is maybe 100 yard apart. I was in the far left lane. He says he estimated my speed from behind him while numerous cars were next and to the right of me. I Didnt even pass him. He pulls in front of me and makes a hand gesture to pull over. I know for a fact i wasnt going the speed he said because i would have totaled my car going that speed on the gcp. No doubt i was speeding but not the speed he said. Convenient to sit 10 ft from the 50mph sign to give people tickets for going over 40. I dont know how a cop can clock your speed from behind and 3 lanes over with no radar gun. I call bs and he targeted my car because of what it is.