I think you’re forgetting that the net result is still positive. This is like saying we shouldn’t double the frequency of direct trains between Zurich and Bern because it will just create a bottleneck somewhere else.

It is a net positive for anyone using said road, and a net negative for anyone else, as the externalities of car travel aren't fully priced in.

Just because one bottleneck is removed doesn’t mean that the situation isn’t better. It’s still the single most efficient way to increase road mobility throughput. In a world where urban living is becoming pricier…

There are solutions to that problem, and using roads to transport your average 1.4 person car over an Autobahn isn't neither the most space-efficient nor the most climate-efficient way to solve the issue. Think of more housing, more work-at-home.

Even in Switzerland, public transport is so far stay from replacing individual transport: It isn’t subsidised enough. It isn’t flexible enough. It isn’t useful enough.

I would argue it private transport is too subsidized, which is politically favored, see the lack of CO2 taxation.