> I understand Paris to have undertaken a serious revolution in purging cars within the past decade.
The issue is that they have mainly increased the friction of using cars in the city (reducing lanes, restricting parking, converting avenues to one-way) all the while the public transit enhancements are running late, and whatever lines were already there saw a drop in service quality.
So increasing density would require a major improvement in public transit. Note, however, that the city of Paris proper already has one of the highest densities in the world.
The issue is that they have mainly increased the friction of using cars in the city (reducing lanes, restricting parking, converting avenues to one-way) all the while the public transit enhancements are running late, and whatever lines were already there saw a drop in service quality.
So increasing density would require a major improvement in public transit. Note, however, that the city of Paris proper already has one of the highest densities in the world.