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I wish it was specified in seconds following the car in front, then it would be independent of speed (unless that is really what 1 to 7 mean - if that is true, then give us the real number).
As for radar, that is no longer active on any Tesla that has it, as far as I know. Is that wrong?
The number is just a guide, the distance is speed dependent. But it is also elastic, meaning as you slow down or speed up due to traffic, your spacing compresses or extends a bit.