Those cars represent the immense waste of resources.
To be more specific, those privately owned cars are. Self-monitoring systems can be developed to keep track of usage and provide cars when required wherever required.
In simpler and more relatable terms, imagine the self-driving uber like service just without the company monopoly. See https://www.thevenusproject.com/resource-based-economy/technology/transportation/ for more.
RE: The Bases of our Economics Are Lost