Quiet night. We just got on I-80, getting off at the next exit, less than 10 miles. It was after midnight, we were relaxed listening to some good music, and driving easy. On the eastbound, not a car in sight ahead or behind so I let the speed drop to around 50 mph. I heard a quick bleep on the detector and in my mirror saw a car doing a U. State trooper pulled me over. You guessed it, got pulled over for GOING TOO SLOW!