When I was 6 my Mom and I went to stay a few weeks with my Brother and Sister when they had their first kid. My brother was in the Marines stationed in Brunswick GA. We went out on the train. My Dad bought a new 1966 Chrysler 300 to drive out and bring us back. It was one of the first cars with cruise control. It was a knob that you dialed in the speed you wanted it to maintain and pushed a button.
Before he got out of the state the Cruise control messed up and wouldn't let the car go over 25mph. He stopped at almost every Chrysler dealership between OKC and the East coast trying to get it fixed. Finally somewhere in Mississippi a smart mechanic rigged it with 4 sets of vise grips to keep it from coming on and limiting the speed. They weren't able to actually fix it until after we got home.
Don't think my Dad ever really trusted it.