I have at least a partial response to that. Open source, shared protocol transit systems.
The internet is, by some standards, an excellent example of what you're saying can't be done and the reason that it works is that the shared protocols are adhered to.
Keep in mind that our current road systems are, literally from the ground up, products of over a hundred years of mass organization thinking. Everything about how they're built, from signage to surface composition, to determination and enforcement of traffic regulations, is an outgrowth of how we handle vehicular rights of way. And then remember that all of this has been subject to vast bribery and subversion by car companies, oil companies, and the like. As such, not much of it would qualify as good engineering. And trust me, I've spent plenty of hours of my life being ranted at by engineers and managers at various DOTs bemoaning this in great detail.
Anyway, go, read the blog post, and think about open standards and shared protocols. Then think about implementation of transparency of operations, another thing that organizational procedures have been advancing for at great speed. This kind of thing can be done. And we're getting better at it all the time.