I was headed south towards Del Rio at edge of town, at 30mph sign looked down and saw i was going 28, 50 feet I rounded corner saw police car on side , looked down again and still going 28. The was a car in the passing lane pulling away. The policeman and the other car traded waves as I saw hands of both wave. I didnt change speed. I was stopped and told I was going 11 over. NO WAY ! The policeman continued to wave at locals as they passed that appeared to be speeding while wrtting my ticket. I felt like I had been robbed. I WAS NOT SPEEDING ! Sonora Texas either have incompetent police or they are funding their little town through robbing travelers. I will no longer spend any money in this town at stores, motels, food , fuel, etc. If they hurt economically perhaps the local businesses will clean up the problem.