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At 60mph, 88 feet of distance leaves you with 1 second to react. You are dead if that semi rolls over a 2x4 in the road. On a drag strip, you are looking for that light to drop and the best anyone can do is 0.4 seconds to start. You cannot maintain that level of awareness for 5 minutes let alone a typical commute or road trip.
Personally I will not follow any closer than 3 seconds, and I have always managed to stop when I need to; sometimes I still have had to make a complete stop unexpectedly.
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I'm not coasting, I'm shifting slowly.
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