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Double lanes are still orders of magnitude less efficient than trains.

In some dense European cities there's physically not enough road surface to put every traveller in a car, self-driving or not.

https://en.m.wikipedia.org/wiki/Route_capacity#/media/File%3...

So basically make the urban environment a sea of constant fast driving cars filling all available space. There's a reason a lot of cities are converting roads and urban centers into non-car area. Parking and car lanes replaced with bike paths and green areas. It's a much better quality of life. Which, oddly, some people prefer to a 1800s style corporate dystopia where most people's miserable lives are nothing but a means to drive ever more wealth to an elite minority.

This is EU, it would rather become a cycling path or some sort of park/recreational zone.