after reading the statue it looks like he wrote you up for being a traffic control device that approximately conforms to an authorized device. WTF I'd say go to court with a print out of the statute and ask the judge what it was that you got a ticket for? if he was trying to say you weren't obeying the speed limit sign (since it is a traffic control device) you need to know what certifed tool he used to determine you were speeding. also if you were the only car in the immediate area then he can't compare your speed to the surrounding traffic. Also find out (actually go back to the location and measure) the distance from the spot you did the u-turn to where he was sitting. Then post on here or find out who can help you with the math of taking the vehicle weight, distance traveled, and both the speed limit and the speed he said you were going. you are basically going to find out the acceleration needed to get up to that speed in the distance traveled, then use the acceleration to figure with the weight of the car to see how much force you need to accomplish that, then convert that force into hp/tq, do that with both speeds, if you were driving heavy footed the math should prove that your car is too weak to do what the cop is claiming. Don't bring all this out in court unless it is looking like the judge is going to side with the cop. If the math doesn't work, throw away the answer. Also if the cop wrote/checked off speeding and then wrote the statute for the traffic control device he wrote the wrong statute and yo should be in the clear for that.