The default state of your rights in the USA is that you are not allowed to drive. It is effectively an additive privilege that you have to go out of your way to obtain.
The constitution doesn’t restrict the government’s ability to regulate the operation of a motor vehicle, and all 50 states have enacted laws that effectively make driving a privilege. You’re even required to buy insurance from a private company in order to maintain that privilege.
The fact that driving was legal by constitutional default before the passage of traffic laws isn’t relevant to the present day legal status quo.
I would also like to request that right wing libertarian weirdos stop equating every mundane, benign, and sensible societal rule to draconian conditioning by the big bad evil government. Please.
Hell, I'd even love to look at such a fantasy map for Atlanta, GA where Marta is built out throw all that crazy Atlantan sprawl...
Despite now having 3x the population of that time period, our rail service is basically non-existent in comparison. This isn’t the case in less wealthy and less dense countries.
What is the cost of the interstate highway system? How much of it could have reduced lanes or not exist if there were trains? How much productivity and GDP is wasted on people operating vehicles on the highway when trains can travel over 3x faster and facilitate continued work?