One vehicle will slow you down traveling at 48 mph then speed up to about 63 and slow again to 48 when you adjust your speed to the speed limit again at the time you come upon the motorist in front of you and adjust again if you are too close to the vehicle in front of you you will get a ticket for "Following too close" Even when traveling at speed limit or below speed limit. The observation of the distance you are "following" is based on an instantaneous observation and not a fair observation of how you are or have adjusted your speed to the erratic motorist in front of you. The way the motorist was driving was in concert with the location of the officer. There is no way I can prove if they are working together or if the motorists action in front of me were as if they may have been picking up radar signals on a radar detector? But this motorist was driving in a manner anybody following would be in a position to have to adjust his distance and be unable to maintain a consistent flow of his speed without coming upon the behind of the vehicle impeding the flow of traffic.