While this would certainly be possible if extensive demolition work were feasible, it is not reasonable to assume that cities will simply be able to demolish the entire built environment and begin again. This raises the matter of how existing cities can gradually be converted to carfree cities. Lyon, France Concept for a carfree Lyon Presented on 30 October 1997 in Lyon. The concept was developed with little knowledge of local conditions and certainly could not be built as depicted. This plan does, however, give an idea of what a conversion of an existing city might look like.
Some trips do require two transfers.
Incidentally, the newest of the four metro lines in Lyon operates fully automatically - there are no crew members on the train. It defines a strategy for reaching consensus on how to design and implement such a radical change.