Earlier quoted context omitted.
In many ways, I think solutions like this are just kicking the can. Travel in a place like Bangkok for one day. Red lights look like the start of a motocross rally. There are even motorbike taxis. And motorcycles deciding the sidewalk doubles as a bike line is a common sight. But traffic is still completely brutal. That's also with city wide subway and airtrain transport options as well. The problem is simple. People…
Amount of potential traffic can't grow without limit. People need space to do other things. That puts a natural limit on the amount of traffic because people don't go places just to get there. They go places to do something when they get there.
The big underlying factor is population increase, both permanent increases of the local population and temporary increases from visitors. Though I imagine there are also other factors even beyond that one that also increase traffic. It's probably safe to say that increased income results in more activity involving transport, for instance. I'd agree there's definitely some theoretic cutoff where it becomes practically physically impossible to squeeze any more people into an area, but I'm not sure how practical it is to consider that since you're hitting major dystopia long before you get to that point.