There is simply no way to make enough tunnels for personal vehicles. That is basic city planning. Building more roads increases congestion.
The only _real_ way to achieve the above goals are building bicycle friendly cities with diverse public transport options and less parking spaces. There are European cities that function more like this.
Any reason you can't make tunnels? I've spent a while in San Pedro, Spain and it's been transformed by a cut and cover tunnel that the cars now go through. Seems to work fine.
The only _real_ way to achieve the above goals are building bicycle friendly cities with diverse public transport options and less parking spaces. There are European cities that function more like this.
This is anathemic to the US of course.