Cruise control was introduced by Chrysler in 1958. Ironically, it was not called "cruise control", it was called "Auto-Pilot"!
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Yes, in 1958, before automation had any pretensions of steering or braking the car, it was called "Auto-Pilot". Apparently, that name was too "dry" sounding so they switched to the more luxurious sounding "Cruise Control".
Cruise control was a luxury only item until the oil embargo and high gas prices of the 1970's made it a very sought after feature to reduce gas expenses. People were installing their own vacuum controlled automatic throttles. It was not a quick, easy or cheap mod to make and on most cars it would only work on gentle to moderate up hills depending upon the power of the engine . On downhills the car would still gain speed regardless of the set speed, sometimes allowing dangerously high speeds to be reached if there was a corner at the bottom of the hill.
Ahh, the good ol' days when American Corporations would never misleadingly advertise a mere throttle assistance aid with a word implying it could pilot you on a non-stop flight to Europe. But humans were less gullible in those days and didn't need well-meaning people to point out that it couldn't pilot the car, it could only regulate the throttle.
Tesla's system, while still just a driver's aid, really can pilot the entire car by operating brakes, steering AND throttle. That still doesn't mean it doesn't have to be supervised.
All Autopilots require human supervision until full autonomy is reached. We still don't have fully autonomous oil tankers, cruise ships or airlines, even though every last one of them have multiple redundant autopilots installed (in case one of them breaks). Very expensive autopilots. A pilot is still required but an autopilot can make the task considerably easier, safer and more pleasant. Autopilots are here to stay.