Distance based cruise control was first developed in the '70s, but was not widely used. I think it may be available on a few cars. I suspect US liability laws may be slowing its availability.
Yah, at the same time as I was wishing for it, I was thinking about how folks would misuse it. I may be missing something on the liability front, 'cause it seems to so-not-a-lawyer me that manufacturers ought to be able to set things up in such a way that ten-T errors are clearly the legal responsibility of the users, but I can see how it'd be some work to engineer out as much of the temptation to stop paying attention as possible.
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