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I modify the rule depending on the vehicle I am following. Sports cars can break harder and faster than me so I give them a little over 2 seconds(because the increased breaking power with the possible lighter weight(most aren't but hey) could cause a collision even if I braked immediately). Semis. . .yeah they can't break anywhere near as fast as I can. I stay about a half second depending on speed. Officially the rule still in TN is 2 car lengths(which at 60 mph puts you pretty close, but semis as stated can't break very fast(24 feet opposed to my 36).
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