Why inefficient? I thought its structure would make it more efficient, or am I missing something.

Edit: I read about the intersections now, but if they act as roundabouts it should be able to work just fine right?

I have seen some comments complaining about the traffic so probably not.

It feels like modern cities, at least here in Europe, are trying to effectively remove traffic from their centers. They do this, seemingly, by making car traffic a burden, and public transit easier and often free! I’d say La Plata would be perfect for this!