Even my Mazda has adaptive cruise control powered by a computer as powerful as any on the planet: my brain. I like cruise (which the Mazda lacks) but as for the part that maintains a safe following distance, that I can easily do. Cruise control to me is a inconvenience item, not a safety feature. My adaptive cruise knows exactly when to slow down, can see weather coming, knows when it's dark, watches entrance points for level crossings, and so on.