I actually think the U.S. Founding Fathers would have enumerated a "right to vehicular travel" if they had conceived of license-as-a-privilege restriction on horseless carriages.
We'll never know though, which makes personal conjecture meaningless. And while the "Founding Fathers" may have had some singular ideas at the time, they were merely people. We could speculate what the authors of the Magna Carta might feel about drones, or the Athenian democrats as well...
Either way, I couldn't care less about what people who died 200+ years ago would have thought about cars, except in an abstract "wouldn't it be cool to show George Washington a modern car and see how he reacts" sort of way.
In light of the second amendment, that seems unlikely.
I think it's funny that both of these replies center on refuting my idea that they might be frightened, but ignore the more important idea that what they would or would not think is not important.
The philosophy of the Founding Fathers is extensively documented. Not the least of which is their carrying out revolt and secession against a superpower for the purpose of securing personal liberty and minimizing control & harassment by government. In light of that, the notion of them fearing cars and using government to restrict ownership thereof by punishing lack of paperwork is absurd.
This is not a good time investment for children, given that not all of them will drive. Especially, considering that driverless cars are coming soon.