With cruise control drivers can rest both legs and don't worry about speed, they only need to control the ca direction with steering, and they only need to take control of the speed in case of emergency at any moment.
And they are ALWAYS slower in taking that emergency control when their feet are "rested" by being away from the pedals...I've shown you two studies (at your request), which you've dismissed.
In plant control rooms, the problem is clearly evident, and subject to a huge amount of actual research, and there are specialists in space design who try to keep operating staff alert enough to manage a crisis, without peaking all the time.
What's so hard about this well know concept applying to operators of motor vehicles ?
I told you the studies you posted are junk science by idiots in France.
There are no data of any kind pointed to using cruise control resulted in more accidents.
Everybody after diving 5-10 hours was much fresher with cruise control than without.
What is wrong with you for not understand that if your feet or legs are at 1 position for hours isn't the best for your health and your reaction will be much slower.
No study is need for this simple fact.
With right foot at exact position and angle on gas pedal for hours would get any one tired. Why did you change right foot to left foot in controlling the gas pedal ? If your right foot didn't get tired why took a risk ?
I did drove from Springfield, IL to Pittsburgh, PA a distance of about 570 miles in mid 70's, the speed limit was 55 MPH. It took me a total of 13-14 hours(with 2-3 stops for gas and food) with the 1972 Mustang. I had to use left foot to control gas pedal after the first 3-4 hours, then used left foot again after several hours after right foot was the controller.
You really should see a medical practitioner about your problems.
Actually, you should see a brain surgery to examine your brain, you seem to have serious deficiency in understanding simple facts.
No, my personal experience and of may others, CC is a much better tool to use for long distance travel. It is almost impossible to find a newer light duty vehicle(car, SUV/CUS, minivan, PU ...) without cruise control.
If CC isn't as good as human foot in controlling speed(especially for long distance travel) for long distance driving then why all car manufactures include it as standard equipment for many years already. I am not talking about smart CC (Adaptive CC ?), I am talking about dumb CC available in most cars.
Because people want it...they want the Tesla technology (that Tesla should be charged with for beta testing on public roads), and they really want to be able to text and surf the internet while driving.
In my post I am talking about dumb cruise control, not the advance adaptive one. The dumb cruise control is helping me and most drivers on long trips tremendously. This is fact not fiction.
About Tesla autopilot, it isn't ready for Primetime yet. It still has some flaws even with current release. The main flaw is it doesn't have capability to recognize cross traffics, that why a driver got kill in Florida accident.
This is my final post about standard cruise control in respond to you: It is a wonderful equipment that help drivers tremendously on long trips. Your linked about slow reaction of users of cruise control in a study in France was junk, only you believe it but I don't.
Wound up switching feet on hills, as it bothered my right foot to drive with it planted down for the duration of the hill. Once at the top I'd switch back. Did about 12 hours of driving each day doing that. I managed. 
