Four to six second following distance for speeds under 30 mph, and six to eight seconds for speeds over 30 mph. It's part of the 10 point commentary, it sounds good and all, but have you really ever thought about this? At 60 mph, 8 seconds is 704 feet; the length of 2 1/3 football fields! How can this be done realistically? Is it possible to pick a marker and start counting when a vehicle is that far ahead of you? Like I said, it sounds all right and good, but if you were on the interstate and someone passes you, you would constantly be slowing down when they got in front of you.