I was on my way to Dover when I got this ticket in Maryland. I am not sure what was my speed and the road was almost empty except a few speeding cars overtaking me. Then a traffic cop was driving in opposite direction and he passed by me. Later I entered an area where speed limit was 50mph, and I reduced my car speed to 40mph. Then I noticed that the same cop was following my car without any stopping signal. After following me for around 1/2 a mile, he hooted the stopping siren. I immediately stopped. Cop came to my car window while I still inside the car, and told me that I was driving with 68mph in an area of 50mph. I said that my speed was only 40mph. He said "well, yeah, but you were driving 68mph on a 50mph road before". After this he asked my license and gave me a $90 ticket.